A highlight of my day is when I get a notification you've uploaded a new video. These videos can't be long enough. Keep up the great work! Loving this series. Can't wait to see 8208XBRs results.
Johnny's Reloading Bench video every day in December? I watch your videos like I watch my favorite show. Love your videos. You taught me a lot and you also inspired me to reload for my 20inch 556 barrel. Great video keep em coming.
Get ya a decent 0-1 micrometer that has a vernier to read tenths, .0001. And Mic the brass just above the case head. A bulge in this area greater than .0005 will show before you start cratering and flattening primers. Make notes of the dimension and you have a good idea where your pressure is at. I learned this technique many years ago competing in benchrest, those old guys sure know their stuff.
Haha saw how old this was and instantly became sad . I can’t find 2520 anymore and it’s my favorite. Did get some N140 and that is good but when mag dumping into trash as one does it makes the gun noticeably hotter than anything else I’ve used
I was really hoping for a better showing from BL-C(2), but I should have known better. It's a great plinking load with 55 grain loads, pretty much my go-to. Thanks for all the info brother!! Great videos!!
I was too! It shot pretty darn well on the low end, though. Powders act so differently in various cartridges, or with different bullet weights in the same cartridge, that I really try not to "hate" specific powders. They all have a place somewhere in the infinite world of barrel/bullet/primer/brass combinations! I'll be sure to test BL-C(2) with some 55gr bullets very soon!
I might of refreshed the page a handful of times trying to catch an ad for you. But then I wanted to watch the video. So I watched the video. But I'll refresh a few more times trying to catch and ad for you!
Don't sweat it, brother. UA-cam is still not selling enough ads, so that will still happen a lot. Enjoy the video and go about your day! I really appreciate the attempt, though!
i shot these same loads today . tac , lc brass, 205m, but from a 20in wilson barrel. my loads were 70fps higher but the load open up at 24.9. and got worse. my 24.6 you could cover with a nickel. thanks for burning the powder. love these videos.
You should have bought the Western Powders No 1 handload manual while it was in print, or look for a used one. Western provided true 5.56mm NATO data. I wouldn't get too hung up on the Black Hills load, although I'm sure it's great. They are simply following what Chris Kyle had originated. A 77 gr. OT Match bullet leaving the muzzle at a minimum 2700 FPS velocity, and you'll need NATO data to do that safely from a 16" barrel. The purpose was to get the bullet to "tumble" out to 300 yards. I worked up the Mk 262 Mod 0 some years ago while also being curious about how the SIERRA 77 gr. bullet performed at shorter distances. It did poorly enough that I began working with the Hornady 75 that you get in the TAP 2 and the NATO Match. And because velocity potential is a bit higher than necessary with AA 2520 and TAC, the goal was 2750 FPS from 16" barrels while the Hornady 75 is a heavier constructed bullet that stays together. It also allows you to load at 2.250" and crimp the case-mouth into the bullets cannelure. Taper Crimp in my case. And with the charge of TAC decided on because of velocity and uniformty, from a good barrel 10 rounds over the chrono will give an average Standard Deviation of 10 FPS or less using depending on the primer. The standard CCI 400 SRP is capable. Now is this load more accurate than the Black Hills? You'll have to see for yourself, from your rifle. From a Colt's/Bold Ideas CRX 16", we saw 1/2 MOA for 10 rounds.
It makes sense that accuracy would fall apart on the high end with the blc2..I use 26.0 for my 55 grain fmjs..I could see 25+ grains being a bit much for 77 grain..I appreciate you sharing your expertise with us. You've helped me develop my own loads with your testing a few times now..
I noticed that your using LC Brass but all different date stamps on the head of the brass. This means different lots of brass. I ran into same problems with my groups opening up using mixed LC brass. with TAC powder. Now I use only one lot of brass either Nosler , Lapua. or Star. My groups srank down to less half minute of angle @ a hundred yards. My best has been 0.255"
My uncle got me started reloading in the early 70"s for a brand new at the time Model 88 Winchester in .308 Win. that I bought new at the time and still own. Has taken about forty deer and a box car load of coyotes sense then and is still a tack driver. I tried BLC 2 back then in it. and the best memory of it was the stuff was the basketball sized fireballs at the muzzle when you squeezed a round off. From then on for years IMR 4064 was all I needed to know to load .308's. In my recent elder years I've tried Varget and other powders in it and my experience with the .308 is that about anything that will get a bullet out of the barrel will shoot good. I think I still have a partial 50 year old can of BLC 2.
For that broken uniflow, get a Dramworx Pyrex hopper replacement. I got one and it rocks bro. I know I'm late to this, but just revisited this series as I'm doing loads for a MK12 build.
Patreon'd. I'm getting into reloading because of your videos about mk262 cloning. Looking forward to seeing what my Criterion and BA barrels can do with the stuff.
The higher end of BLC(2) did the same for me. Both from 20” A1 with 4-16 optic and a 11.5” CAR with eotech +magnifier, I would get 3/4 shots grouped good and then it’d go high left 1-3 inches, no matter if it was hot/cold, suppressed/3 prong/muzzle brake/bare muzzle. Hotter loads showed wild groups, but 24.9/25.1 was the sweet spot with 77gr Berger and Sierra SMK 77s. No.41 primers, SIG 5.56x45 brass. In my experience. Love ya videos, got me going on the Mk248 Mod 0/Mod1 for my Mk13 Mod 0 build.
Supressor causing secondary pressure spike? I run 25gr blc2 with a 77smk for NRA service rifle and usually run .500" groups 100 yards. Iv run the 77s up to 27gr before wich dicks up the brass quite proper. I'm back to BLC2 this year with the tipped 77smk. Might try shooters world / Lovex match rifle powder for hits and giggles.
I think at the higher velocities and preasure the barrel was starting to have trouble, inconsistently stabilizing the bullets with the combo and/or are what i call presure curve gas system anomalies.the preasure in the gas system could have been just at the point where the bolt starts and was just beginning the unlocking process as the bullets about to leave barrel the bolt carrier is just beginning to movement rearward travel the movement creates the flyers. Its the get right warning thats ussually followed by bent case rims when the ever higher faster crowd people like me keep PUSHING forward for no good reason
Looking at max loads of propellants that get a 77 Gn SIE in the 2750 FPS range in a 24" test barrel, BL-C(2) 2804; CFE 223 2811; Rel 15 2783; and 2000 MR 2856. These are in order of "quickness". I wonder what a less quick propellant like Rel 16 will do...hmmmm, no data.
Seating depth seems to have a significant impact on accuracy. Wonder what the accuracy would have been if you would have seating the OAL 2.260. Just curious
Barrels whip, and if the bullet leaves the barrel in the middle of the whip when the barrel is really moving along, it can be all over the place as a slight variation means the bullet leaves at a different location, but if the barrel whip is slowing to return the way it came the barrel is moving slower and the bullets are closer to the same spot when they leave the barrel, so are more accurate.
Not sure what your prevailing density altitude is, but when I lived in the Southern California, I used AA2520, a wolf small rifle primer, and a lake city case and got 2908 FPS from a 20 inch RRA 8 twist barrel with no pressure signs. ( it was on the ragged edge though) When I moved back to North Carolina that load blew primers and I had to tear apart the rest of my stash and work up a new load then reassemble my stash. My point is that if you haven't reached your goal yet and haven't tried AA2520, you can get good speed with it in a 20 inch barrel. I'm now in the 2800 range. Don't forget, the velocity data for real mk262 was with an 18 inch barrel. With a longer barrel you can get really good numbers. Also, in both my old RRA barrel, my BCM 7 twist barrel, and my new Criterion hybrid barrel, none of them can tell the difference between Nosler 77's, Sierra 77's, and hornady 75's no matter what powder I was using.
Really enjoying your videos. I had a thought not sure if anyone has said this yet. Try putting colored marker on the but one of the cartridge covering the primer and every thing else. Will show the marks that you are talking about. I believe that if it it colored and has a hit the hit will show where it marks the brass. I think.
I shot some imr 4320 with cci450 and hornady 75hpbt and was getting groups of the .46 &.47 during my work up, my loads were past hodgdon data but didn't show much of any thing on the primer and wasn't getting ejecter swipes, wondering if you've heard anything on it, the burn rate is very close to varget and is pretty cheap in my area. Also results on par or better than varget in my 6br, so far.
I'm with your grandfather on Bl-C2. I could never get it to group anything with my .223 loads. Nothing. Ended up just throwing a mild load and using it up on fmj blasting ammo.
Not that it matters but I'm still not convinced that you have the right bullet.. has anyone reached out to black hills to ask what bullet manufacturer is being used? I would bet it's some bulk military manufacturer.. maybe general Dynamics?.. Johnny can you get your hands on the federal 77gr otm 5.56 ammo?.. it's tough to find but would be interesting to pull some down and compare bullets
The person who developed the round stated it’s a 77gr smk , then 77gr smk with can. Also they had to use a 77gr nosler I think for a little bit. There’s a video my small arms solutions with an interview I believe
I'm pretty new to loading, but I didn't see anything about your barrel twist rate ... Could it be that your barrel doesn't like stabilizing the heavier bullets with the slightly hotter loads ?... It seemed to me that when you got much over 24 gr. the groups started opening up like a 1-9 barrel might do ... I'm a rookie so take this as possible bs . lol
I use tac at 24gr's i get pressure signs with certain primers on hot days, I also have noticed a significant velocity loss and poi shift at long range on cold days
It seems like 2650ish fps is the last good group for the powders no matter the primer. Could the higher velocity cause the bullet to be less stable? Hope you have a good hunting season! I wish we had elk hunting in Missouri. Conso is trying to reintroduce a herd but we can't hunt them yet haha
I don't know enough about internal ballistics to even come up with theories about what causes this sort of thing! I'm a big fan of all these elk reintroduction projects. Even more so now that I drew a tag! :) I'm really excited and can't wait to hit the woods!
wierd youre getting those big fliers with BL-C2. My 20" FN shoots the 24.5 and 25g load with either a 77SMK or Horn 75bthp crazy good. I havent gotten anything under 1" with TAC, which is perfectly fine, but BL-C2 and 8208 XBR have been my best 75/77 match loads
In my Daniel defense it mostly hates cfe223 and shoots big groups like you were seeing with blc. So far I’ve found one combination that works decent to at least get rid of the rest of the powder I have. Varget seems to work a lot better. I want to try tac and maybe some other powders. It seems like cci 41’s throw off groups as well idk what the heck that’s about.
I have 2 16” rifles , 1 shoots .7 moa with my cfe loads the other puts em at about 1.6. Both rifles shoot factory 77gr smk less than 1 . Its baffling and cfe is the only powder I’ve found this anomaly with.
Thanks to JRB, I'm becoming a gunpowder collector..LOL I have tried several new (to me) powders, H335 and CFE233, and been comparing to TAC, which has been my go to clutch powder for a while now. Enter BLC-2.... coming soon to my bench. Used to use maybe 4 powders for my rifles and pistol, now have 10.. sigh.. My bullet order will be here soon and I'm gonna use a bunch of it up. Get Some!!....oops, wrong video..LOL
BLC2 is finicky but accuracy can be achieved, one thing to watch is primer pocket depth and consistent brass as in the length of the solid portion of the case head. Blc2 can get wired because it doesn't like to light consistently, I had tonnes of the stuff and had the $motivation to figure it out so I could use what I had. Some of my best groups with a 6br no turn neck and my A2 service rifle. ..my teamate uses VV140 with the 77s and swears Buy it.
with BLC2 would a different bullet perform better? Seems the extra pressure is ramming the bullet down the bore at a slight cant? Maybe bullet jacket or bearing length changes things?
Hey man. I love your videos and just all the detail you put into them. Im looking to try reloading my .223 and .308 with IMR 4895. Ill be excited to see some data if your up for trying this one.
I have to get my reloading/shooting fix from you even though i have three brand new types of bullets to try out but both the ranges i go to have been closed due to hurricane damage and renovation.
I've been trying to load 75gr hornady with BL-C(2), and I've found I only get good accuracy with the lighter charges/slower speeds. My results mirror yours in that once I reach a certain speed it all falls apart. 16 inch colt barrel just for reference.
Joseph R I have not been reloading very long but I've found that no matter what grain bullet or powder combination I try my Colt 16" 1-7 does not like hotter loads. It likes the lower range and it also likes 2.260 COAL.
You've hooked me. I have a 308 winchester with a 20 inch barrel. Oal is 2.750. I've measured a cut case and bullet and it measured 2.883 and fits nicely in the magazine. I'm not sure what load to safely start with and what the pressure change this would cause by changing the oal. Can u steer me in a safe direction. Nosler etip recommends 2.750 with a varget load 42.5 low to 46.5 as high. Thanks....
150, 168, or 180? Why do you want to go longer? Are you not happy with the accuracy at 2.750"? Going longer is generally not a big deal, since that means more room in the case, which means lower pressure and velocity for the same charge weight. As you get really close to the lands or jam into them, I've always read that you can experience a quick pressure spike and need to watch out. For that reason I would suggest staying back off the lands until you are more comfortable. I would suggest loading up some rounds at 750, 775, 800, 825, 850, and 875. Then go shoot them and see what happens. Start short and work your way long, watching pressure signs as you go.
You might not know this but you need to check each different bullet you shoot for absolute OAL. (I.e. 150gr, 168 gr, 175gr, etc) Different profiles to the ogive will give different OAL.
Usually if you can get the bullet seated about 15 thousandths off the lands you can find accuracy. However, this is very bullet dependent. Some bullets make the jump just fine. If you're shooting a stock Remington 700 they have notoriously long throats (transition between chamber and lands) this allows for a wide range of factory ammo to be consistently accurate. Now to you're original question. I still would work up to the max charge carefully even with the extra case capacity that the longer seated bullet will give you. So whatever powder and bullet combo you are using go by whatever the manual (powder or bullet) recommends. Then if you reach max charge and there is no pressure signs work your way up by no more than 2 tenths of a grain at a time. What I usually do is find my most accurate powder charge at 2.800 OAL then slowly work my OAL length out and see if tightens my group up.
I like blc2 because of the history the price all the stories and before u crank the pressure it was shooting 1/2moa lots of controversy but this has been around forever it’s a economic fast to produce powder and has been since ww1 ! The first batch ot ran apparently lasted almost 60 yrs ! And has spawned dozens of other powders with variations. Like wc748 I’m loving that one right now cool burn low flash and cheap
Ball-C-2 has had a lot of variability in burn rates through the years. Not so much lot to lot but throughout its history as a whole. I have shot probably 50 lbs of it over the years and my notebooks show that the stuff from 10 years ago took almost 2gr less powder to reach the same velocity than a lot from present day, in a. 222 rem that's a pretty big change. I think some of the data that is in the leading books incoorperate some old data especially for powders that ahve been around a long time like BLC2.
I had some Defiant Munitions 77gr otm in my Criterion barrel build flow down into the ejector bore this weekend, I assure you that’s not that bad. Mine would cut you if you weren’t careful
good job john..... i'd like to buy an econamy ar..i went too the web site of your ar and everything seems to be sold out.. politics and the news points out , these may not be avalable for long....what would you buy in uppers, lowers etc triggers.........maybe used ar and replace barrell, like you did.
Jrb, Id love to hear your thoughts on your press vs the Lee turrets. I've been told more accurate ammo out of the lee's due to the sloppy head increasing alignment and concentricity?
I don't have direct experience with the Lee but I've heard good things about it! I don't think an average reloader would notice the alignment and concentricity differences you mention. I only recently got a concentricity gauge, so maybe I will run some tests in a future video.
Thanks JRB for another great video. Those magnetospeed chronometers seem a bit fussy to how they are set up and their distance from the bore line. I know you can change the sensitivity from Regular to Hi and Hi2. Which sensitivity worked best for you when you are doing your testing with the Omega?
The sensitivity settings on my V3 go from 1-11. 2 is the default and that is what I used for all jacketed bullets. For lead bullets I sometimes need to bump it up to 3.
Thanks. I have the cheap-o version of the magnetospeed that doesn't have the same fine tuning as the V3--I only get 3 choices. However, you are still a big help. I am guessing that I would need to use either regular or Hi 1. I should have bought the more expensive magnetospeed but now it's too late. I am stuck with the "sport" version for now.
The underlying technology of the sporter is the same, as far as I know! I've often wished I had bought the sporter version and saved the money! If you are having problems, I would suggest putting it on normal sensitivity (unless you're shooting lead) and focusing on the distance to the bore line. I was nervous about getting it too close in the beginning but that's what it takes! I also chased my tail a bit at first with the sensitivity but soon learned to just leave it alone at the standard setting. Does the sporter come with the alignment guide rod? If not, a dowel rod down the bore or a piece of 1/4" square metal rod from the hardware store might help a lot!
First time working with TAC and I threw 24 grains flat. Been shooting it with great results but I finally hung the magnetospeed on my whiteOak 18” mk2.5 3gun barrel is running it at 2749 average of 10 shots. With pressure so I guess it’s a reason we don’t blindly copy data of the internet. Even if it’s coming from the king
Same thing happens when I load hot with BL-c(2)---it REALLY opens up. Sometimes CFE-223 does the same thing with my heavier loads. I had one barrel --18" 1:8 faxon actually , that loved 25.2 grns of bl-c(2) behind 75 grn hornady bthp but other than that one instance/barrel, it usually opens up BAD......it is not your gun brother. Same thing happens to me.
I've been screwing around with my audio a bit lately to try and help out the headphone users. I may have taken it too far in this video. Sorry about that.
Your cases are sooted up. Was it from the lower grain load or was it through the entire test? Do you allow your gun to cool between groups. Not criticizing just curious. Your videos are very informative.
Seems like you got the best SD’s of any of your loads at the upper end of TAC. On the one hand, the BH ammo didn’t have swipes or rings on the head. On the other hand, your pet load with 2520 looked to have some flattened primers, whereas these do not. Obviously, you do you when it comes to safety, but I think there is a node in there worth investigating. I’d narrow my charges to 24.3 - 24.7, trying both of these primers. It’s just too hard to discard those single digit SD’s. And I’m not so convinced those case marks are all that bad. I’ve seen worse on factory ammo, plus it could be an indication of excessive shoulder bump in your sizing die...
I want to learn so I’m asking, what about the shoulder bump can lead to the swipes of over pressure? Case sized too small? Even if it’s just using full length sizing due?
I found a load combination for blc2 that might make you like it I worked up several different loads with it an was right with agreeing with you an your grandpa that blc2 powder is trash! Until today I found that 26.3 gr of blc2 with cci 450 magnum small rifle primers and hornady 52gr bthp match bullets an 52gr Speer hp varmint bullets both shot sub half moa groups at 100yds I'm loving the powder now ! Btw I am seating at .050 off my lands for total of 2.2 COL.
First. Load question. I have CFE223 and 220gr SMKs, what's a good load for an 18" AR10? I guess whatever is 5% under max would be fine, but I can't find much info on 220gr 308 loads Also, do you publish your load data anywhere? I'd be interested in using some of your data (not your max loads, but stuff just short of what you really wanted.)
Hornady manual to the rescue! That's why I love the Hornady manual so much, and why you see it in just about every video. They always seem to have the weird and less common stuff covered. For the Hornady 220gr ELD-X at 2.800" they show CFE223 37.0-42.6. 2200 fps from a 22" barrel. That should be enough to get you started. Start low, work your way up as usual. I don't really have load data, per se. I am reading from a load manual or a powder website in each video. 300 blackout subsonics are just about the only exception, and I haven't really compiled my findings. I usually have to go back and watch my own videos to remember things!
Johnny's Reloading Bench thanks! I don't really have much area for Chronoing my loads, so I watch your videos and then go with your third lowest result usually. I'm really only doing plinking loads since I don't have anything besides an indoor range right now. I'd love to be able to shoot at a longer range every day. You anywhere near Philly? Lol
They still look closest to Remington 7 1/2 but there are some subtle differences I showed in the last video. I plan to stick with the Remingtons unless I find something that makes me want to switch back to CCI 41's.
Johnny's Reloading Bench Lol. I was referring to the primers that were in the box that looked like the CCI 41. Ever since I found your channel I watched them like a crackhead even the hour long ones I love them. You go so into detail about reloading you pushed me into it. Thank you for your videos
I know this is old and you likely already found the answer to this but in case not and more so for others that might read and wonder the same thing, Yes... That was the whole point of the Wylde "chamber" (its really just the throat that is different). It is a config derived to allow 5.56 to be fired with closer to .223 Rem accuracy but not the over pressure risk that comes from firing 5.56 in a .223 "chamber" (again, the only differences are in the throat). When the 5.56 chamber specs were designed, it was chosen to make the free bore diameter a slight bit larger and longer for a number of reasons and it allowed for the cartridge to also be loaded to higher pressure but the sacrifice was accuracy. One of the reasons for the larger and longer throat was to reduce likelihood of dangerous overpressure situations if the inside of the barrel get wet and to prevent jams if small debris (sand and dirty and such) gets into it. The Wylde chamber (throat) is basically the .223 throat diameter (which help bring back the accuracy) but with the longer throat length and leade angle of the 5.56 chamber. The idea of it is that the concern for debris and water is not an issue in the civilian side of things unlike military side so reduce the diameter brings back the accuracy but keep the long throat to deal with the higher load pressures. This is one thing that Johnny here used to always seem to have backward when talking about seating depth and saying that seating deeper will cause higher pressure which is opposite of what is true. While pressure does tend to rise a bit faster when you seat deeper, the peak pressure is however often lower when you seat deeper. This is why the Wylde allows you to safely fire 5.56. The longer throat is essentially the same as seating deeper. In general, the closer the bullet is to the lands, the higher the peak pressure will be for a given load because the bullet has to engrave into the lands before it can get going down the barrel. By seating deeper (or by lengthening the throat for the same seating depth), you are giving the bullet a longer running start before it has to engrave into the lands. This then allows the bullet to get further into the barrel before enough powder had burnt to achieve peak pressure. This can easily be tested (and has been many many times) by loading a cartridge to the point of peak pressure with the bullet touching the lands and then with that same powder charge, firing it with the bullet well off the lands and test will show that you are no longer at the same peak pressure, even as little as .010 jump can be worth several thousand PSI drop with certain combinations. Think of it like this, if you walk up to a closed door (like say a bedroom door) and just put your shoulder into it with all the force you can, most people will not be able to bust it open. No on the other hand, stand back and take a running start at it and most people will be able to bust it open and those who do will only kind of fall into the room when the door gives way. Now stand back away from the door and take a running start at it. Most will not only bust through the door but will make it well into the room before they can slow down and stop. All in all, it doesn't take much pressure (force really) to get the bullet to leave the case but it take quite a bit to get it to engrave into the lands and and get going down the barrel. By giving it a running start, it can get to a higher speed (remember energy is a product of mass and velocity) and thus more energy to engrave and make its way down the barrel and the further it can get down the barrel as the powder burns, the slower the pressure will rise and the lower the peak will be.
I'm not a reloader, hoping to start soon. I'm just curious if, being as the Mk626 was initially designed for a SBR, the changes in accuracy at the higher velocity might be do to you shooting them out of an 18 inch barrel. Like I said, I'm not a reloader.
@@charlesduncanmckinley920 www.sadefensejournal.com/wp/black-hills-ammunition/ This is the only article I was able to find stating it was designed for the mk12.
Getting right about 2810fps with 24.3-24.4 of tac out of my 20in barrel federal 205 primers lc brass. 75gr hornady bthps 24.5 shot pretty good but had a much bigger ES and anything less than 24.0 was giving me HUGE spreads of like 100fps differece from 2665 to 2766 (could have been chronograph but it was only around that node it was nearly that bad). 24.1-24.3 was giving the best es and sd. Have done limited testing so far but was really happy so far, shot about 1moa but couldve easily been better with a precision scope and some more patience by my part. Will update if anyones interested, currently sorting thru a few hundred pounds of brass
JRB here's a tip in figureing out why you were getting the huge flyers in your groups, why don't you weight each and every charge by hand ? and not use your RCBS uniflow powder measure
@@PC-vq5ud yes I have have watched many of his videos, he has caused so many variables by changing the way he measures the powder. Using electronic scales, beam scales. He has changed different primers, different brass cases.
If I were using TAC and my rifle got the same results as yours, I would go back and shoot from 23.9 In .1 grain increments to 24.2. Hopefuly I would find out that 24.0 or 24.1 would also give me a half inch groups. So long as my powder drop stay within that .3 grain charge zone I can just fire my my progressive press and load enough half moa ammo in a weekend to last me at least 3 to 4 months.
Johnny's Reloading Bench it was an ad trying to tell me how to make money on the internet. I can afford mansions! And then the ad was over and I was a broke youtuber again.
I wish that JRB would come back and post. By far his channel is in my TOP 5.
I wonder if he passed away? If he didn't it would have been nice to have him make a last video ending his channel.
Watching old JRB videos gets me pumped up to reload.
Me to
Yep, I’m gathering all the necessary components…
You FREAK. Yeah me too.
A highlight of my day is when I get a notification you've uploaded a new video. These videos can't be long enough. Keep up the great work! Loving this series. Can't wait to see 8208XBRs results.
We'll, comments like yours are the highlight of MY day, so this is a mutually beneficial relationship we've got going on here!
Your hunting season is killing my entertainment back to a video every day!
Video every day December? That's what I'm thinking!
And it would be like a whole month of Christmas :)
Johnny's Reloading Bench video every day in December? I watch your videos like I watch my favorite show. Love your videos. You taught me a lot and you also inspired me to reload for my 20inch 556 barrel. Great video keep em coming.
Get ya a decent 0-1 micrometer that has a vernier to read tenths, .0001. And Mic the brass just above the case head. A bulge in this area greater than .0005 will show before you start cratering and flattening primers. Make notes of the dimension and you have a good idea where your pressure is at. I learned this technique many years ago competing in benchrest, those old guys sure know their stuff.
24.3 of TAC has been a winner for me. I scored 4 lbs of 2520 a few weeks ago and I'm really optimistic.
Are you using a 5.56 chamber or .223 Remington chamber ?
Haha saw how old this was and instantly became sad . I can’t find 2520 anymore and it’s my favorite. Did get some N140 and that is good but when mag dumping into trash as one does it makes the gun noticeably hotter than anything else I’ve used
I was really hoping for a better showing from BL-C(2), but I should have known better. It's a great plinking load with 55 grain loads, pretty much my go-to. Thanks for all the info brother!! Great videos!!
I was too! It shot pretty darn well on the low end, though. Powders act so differently in various cartridges, or with different bullet weights in the same cartridge, that I really try not to "hate" specific powders. They all have a place somewhere in the infinite world of barrel/bullet/primer/brass combinations! I'll be sure to test BL-C(2) with some 55gr bullets very soon!
I might of refreshed the page a handful of times trying to catch an ad for you. But then I wanted to watch the video. So I watched the video. But I'll refresh a few more times trying to catch and ad for you!
Don't sweat it, brother. UA-cam is still not selling enough ads, so that will still happen a lot. Enjoy the video and go about your day! I really appreciate the attempt, though!
i shot these same loads today . tac , lc brass, 205m, but from a 20in wilson barrel. my loads were 70fps higher but the load open up at 24.9. and got worse. my 24.6 you could cover with a nickel. thanks for burning the powder. love these videos.
You should have bought the Western Powders No 1 handload manual while it was in print, or look for a used one. Western provided true 5.56mm NATO data. I wouldn't get too hung up on the Black Hills load, although I'm sure it's great. They are simply following what Chris Kyle had originated. A 77 gr. OT Match bullet leaving the muzzle at a minimum 2700 FPS velocity, and you'll need NATO data to do that safely from a 16" barrel. The purpose was to get the bullet to "tumble" out to 300 yards. I worked up the Mk 262 Mod 0 some years ago while also being curious about how the SIERRA 77 gr. bullet performed at shorter distances. It did poorly enough that I began working with the Hornady 75 that you get in the TAP 2 and the NATO Match. And because velocity potential is a bit higher than necessary with AA 2520 and TAC, the goal was 2750 FPS from 16" barrels while the Hornady 75 is a heavier constructed bullet that stays together. It also allows you to load at 2.250" and crimp the case-mouth into the bullets cannelure. Taper Crimp in my case. And with the charge of TAC decided on because of velocity and uniformty, from a good barrel 10 rounds over the chrono will give an average Standard Deviation of 10 FPS or less using depending on the primer. The standard CCI 400 SRP is capable. Now is this load more accurate than the Black Hills? You'll have to see for yourself, from your rifle. From a Colt's/Bold Ideas CRX 16", we saw 1/2 MOA for 10 rounds.
It makes sense that accuracy would fall apart on the high end with the blc2..I use 26.0 for my 55 grain fmjs..I could see 25+ grains being a bit much for 77 grain..I appreciate you sharing your expertise with us. You've helped me develop my own loads with your testing a few times now..
I noticed that your using LC Brass but all different date stamps on the head of the brass. This means different lots of brass. I ran into same problems with my groups opening up using mixed LC brass. with TAC powder. Now I use only one lot of brass either Nosler , Lapua. or Star. My groups srank down to less half minute of angle @ a hundred yards. My best has been 0.255"
My uncle got me started reloading in the early 70"s for a brand new at the time Model 88 Winchester in .308 Win. that I bought new at the time and still own. Has taken about forty deer and a box car load of coyotes sense then and is still a tack driver. I tried BLC 2 back then in it. and the best memory of it was the stuff was the basketball sized fireballs at the muzzle when you squeezed a round off. From then on for years IMR 4064 was all I needed to know to load .308's. In my recent elder years I've tried Varget and other powders in it and my experience with the .308 is that about anything that will get a bullet out of the barrel will shoot good. I think I still have a partial 50 year old can of BLC 2.
For that broken uniflow, get a Dramworx Pyrex hopper replacement. I got one and it rocks bro. I know I'm late to this, but just revisited this series as I'm doing loads for a MK12 build.
Patreon'd. I'm getting into reloading because of your videos about mk262 cloning. Looking forward to seeing what my Criterion and BA barrels can do with the stuff.
I would be checking the scope mounts on those large groups
I love you videos i have learned so much and enjoy watching thanks
The higher end of BLC(2) did the same for me. Both from 20” A1 with 4-16 optic and a 11.5” CAR with eotech +magnifier, I would get 3/4 shots grouped good and then it’d go high left 1-3 inches, no matter if it was hot/cold, suppressed/3 prong/muzzle brake/bare muzzle. Hotter loads showed wild groups, but 24.9/25.1 was the sweet spot with 77gr Berger and Sierra SMK 77s. No.41 primers, SIG 5.56x45 brass. In my experience. Love ya videos, got me going on the Mk248 Mod 0/Mod1 for my Mk13 Mod 0 build.
Supressor causing secondary pressure spike? I run 25gr blc2 with a 77smk for NRA service rifle and usually run .500" groups 100 yards. Iv run the 77s up to 27gr before wich dicks up the brass quite proper. I'm back to BLC2 this year with the tipped 77smk. Might try shooters world / Lovex match rifle powder for hits and giggles.
I think at the higher velocities and preasure the barrel was starting to have trouble, inconsistently stabilizing the bullets with the combo and/or are what i call presure curve gas system anomalies.the preasure in the gas system could have been just at the point where the bolt starts and was just beginning the unlocking process as the bullets about to leave barrel the bolt carrier is just beginning to movement rearward travel the movement creates the flyers. Its the get right warning thats ussually followed by bent case rims when the ever higher faster crowd people like me keep PUSHING forward for no good reason
Do you shoot 300 winchester magnum? Can you test 300 win mag with the 215 gr berger? ? ?
Looking at max loads of propellants that get a 77 Gn SIE in the 2750 FPS range in a 24" test barrel, BL-C(2) 2804; CFE 223 2811; Rel 15 2783; and 2000 MR 2856. These are in order of "quickness". I wonder what a less quick propellant like Rel 16 will do...hmmmm, no data.
Ever try a burn test to compare flame color and burn time ? Love the Chanel
Another great video. Keep up the good work.
Seating depth seems to have a significant impact on accuracy. Wonder what the accuracy would have been if you would have seating the OAL 2.260. Just curious
Barrels whip, and if the bullet leaves the barrel in the middle of the whip when the barrel is really moving along, it can be all over the place as a slight variation means the bullet leaves at a different location, but if the barrel whip is slowing to return the way it came the barrel is moving slower and the bullets are closer to the same spot when they leave the barrel, so are more accurate.
Great video as usual, hope you can get back to the 6.5 Grendel again sometime.
Just for grins - At the end of your test, see how barrel time looks for the best of powder groups. (using QuickLoad)
I have found H4895 to be a little more consistent than IMR 4895.
Do you have a summary of all your MK262 videos? Thx
Not sure what your prevailing density altitude is, but when I lived in the Southern California, I used AA2520, a wolf small rifle primer, and a lake city case and got 2908 FPS from a 20 inch RRA 8 twist barrel with no pressure signs. ( it was on the ragged edge though) When I moved back to North Carolina that load blew primers and I had to tear apart the rest of my stash and work up a new load then reassemble my stash. My point is that if you haven't reached your goal yet and haven't tried AA2520, you can get good speed with it in a 20 inch barrel. I'm now in the 2800 range. Don't forget, the velocity data for real mk262 was with an 18 inch barrel. With a longer barrel you can get really good numbers.
Also, in both my old RRA barrel, my BCM 7 twist barrel, and my new Criterion hybrid barrel, none of them can tell the difference between Nosler 77's, Sierra 77's, and hornady 75's no matter what powder I was using.
Really enjoying your videos. I had a thought not sure if anyone has said this yet. Try putting colored marker on the but one of the cartridge covering the primer and every thing else. Will show the marks that you are talking about. I believe that if it it colored and has a hit the hit will show where it marks the brass. I think.
I shot some imr 4320 with cci450 and hornady 75hpbt and was getting groups of the .46 &.47 during my work up, my loads were past hodgdon data but didn't show much of any thing on the primer and wasn't getting ejecter swipes, wondering if you've heard anything on it, the burn rate is very close to varget and is pretty cheap in my area. Also results on par or better than varget in my 6br, so far.
I haven't shot 4320 in a while and just picked up a can a few weeks back! So, you'll be seeing it pop up on the channel pretty soon.
I'm with your grandfather on Bl-C2. I could never get it to group anything with my .223 loads. Nothing. Ended up just throwing a mild load and using it up on fmj blasting ammo.
Not that it matters but I'm still not convinced that you have the right bullet.. has anyone reached out to black hills to ask what bullet manufacturer is being used? I would bet it's some bulk military manufacturer.. maybe general Dynamics?..
Johnny can you get your hands on the federal 77gr otm 5.56 ammo?.. it's tough to find but would be interesting to pull some down and compare bullets
The person who developed the round stated it’s a 77gr smk , then 77gr smk with can. Also they had to use a 77gr nosler I think for a little bit. There’s a video my small arms solutions with an interview I believe
I'm pretty new to loading, but I didn't see anything about your barrel twist rate ... Could it be that your barrel doesn't like stabilizing the heavier bullets with the slightly hotter loads ?... It seemed to me that when you got much over 24 gr. the groups started opening up like a 1-9 barrel might do ... I'm a rookie so take this as possible bs . lol
I use tac at 24gr's i get pressure signs with certain primers on hot days, I also have noticed a significant velocity loss and poi shift at long range on cold days
That's a short coal my Aussie manual is 2260 might drop your pressure a bit how longs your mag ,they fit in my ruger scout no probs
A little bird told me, that black hills uses a powder that would sit just between 2520 and TAC,,, its nickname is tac-slow :)
It seems like 2650ish fps is the last good group for the powders no matter the primer. Could the higher velocity cause the bullet to be less stable? Hope you have a good hunting season! I wish we had elk hunting in Missouri. Conso is trying to reintroduce a herd but we can't hunt them yet haha
I don't know enough about internal ballistics to even come up with theories about what causes this sort of thing! I'm a big fan of all these elk reintroduction projects. Even more so now that I drew a tag! :) I'm really excited and can't wait to hit the woods!
Johnny's Reloading Bench, probably in a scatter node for your barrel at the ~2750fps range.
Stick to the lower accuracy node @ ~2690fps with TAC
Great info here. I am enjoying the series.
wierd youre getting those big fliers with BL-C2. My 20" FN shoots the 24.5 and 25g load with either a 77SMK or Horn 75bthp crazy good. I havent gotten anything under 1" with TAC, which is perfectly fine, but BL-C2 and 8208 XBR have been my best 75/77 match loads
In my Daniel defense it mostly hates cfe223 and shoots big groups like you were seeing with blc. So far I’ve found one combination that works decent to at least get rid of the rest of the powder I have. Varget seems to work a lot better. I want to try tac and maybe some other powders. It seems like cci 41’s throw off groups as well idk what the heck that’s about.
I have 2 16” rifles , 1 shoots .7 moa with my cfe loads the other puts em at about 1.6. Both rifles shoot factory 77gr smk less than 1 . Its baffling and cfe is the only powder I’ve found this anomaly with.
Thanks to JRB, I'm becoming a gunpowder collector..LOL
I have tried several new (to me)
powders, H335 and CFE233, and been comparing to TAC, which has been my go to clutch powder for a while now. Enter BLC-2.... coming soon to my bench. Used to use maybe 4 powders for my rifles and pistol, now have 10.. sigh..
My bullet order will be here soon and I'm gonna use a bunch of it up.
Get Some!!....oops, wrong video..LOL
BLC2 is finicky but accuracy can be achieved, one thing to watch is primer pocket depth and consistent brass as in the length of the solid portion of the case head. Blc2 can get wired because it doesn't like to light consistently, I had tonnes of the stuff and had the $motivation to figure it out so I could use what I had. Some of my best groups with a 6br no turn neck and my A2 service rifle. ..my teamate uses VV140 with the 77s and swears Buy it.
with BLC2 would a different bullet perform better? Seems the extra pressure is ramming the bullet down the bore at a slight cant? Maybe bullet jacket or bearing length changes things?
Hey man. I love your videos and just all the detail you put into them. Im looking to try reloading my .223 and .308 with IMR 4895. Ill be excited to see some data if your up for trying this one.
I have to get my reloading/shooting fix from you even though i have three brand new types of bullets to try out but both the ranges i go to have been closed due to hurricane damage and renovation.
I've been trying to load 75gr hornady with BL-C(2), and I've found I only get good accuracy with the lighter charges/slower speeds. My results mirror yours in that once I reach a certain speed it all falls apart. 16 inch colt barrel just for reference.
Joseph R I have not been reloading very long but I've found that no matter what grain bullet or powder combination I try my Colt 16" 1-7 does not like hotter loads. It likes the lower range and it also likes 2.260 COAL.
You've hooked me. I have a 308 winchester with a 20 inch barrel. Oal is 2.750. I've measured a cut case and bullet and it measured 2.883 and fits nicely in the magazine. I'm not sure what load to safely start with and what the pressure change this would cause by changing the oal. Can u steer me in a safe direction. Nosler etip recommends 2.750 with a varget load 42.5 low to 46.5 as high. Thanks....
150, 168, or 180? Why do you want to go longer? Are you not happy with the accuracy at 2.750"?
Going longer is generally not a big deal, since that means more room in the case, which means lower pressure and velocity for the same charge weight. As you get really close to the lands or jam into them, I've always read that you can experience a quick pressure spike and need to watch out. For that reason I would suggest staying back off the lands until you are more comfortable.
I would suggest loading up some rounds at 750, 775, 800, 825, 850, and 875. Then go shoot them and see what happens. Start short and work your way long, watching pressure signs as you go.
You might not know this but you need to check each different bullet you shoot for absolute OAL. (I.e. 150gr, 168 gr, 175gr, etc) Different profiles to the ogive will give different OAL.
1976kingdom. All the factory loads give me a 2 plus inch group at 100yrds. I didn't know if the .100 plus jump was to much affecting my accuracy,.
Usually if you can get the bullet seated about 15 thousandths off the lands you can find accuracy. However, this is very bullet dependent. Some bullets make the jump just fine. If you're shooting a stock Remington 700 they have notoriously long throats (transition between chamber and lands) this allows for a wide range of factory ammo to be consistently accurate.
Now to you're original question. I still would work up to the max charge carefully even with the extra case capacity that the longer seated bullet will give you. So whatever powder and bullet combo you are using go by whatever the manual (powder or bullet) recommends. Then if you reach max charge and there is no pressure signs work your way up by no more than 2 tenths of a grain at a time. What I usually do is find my most accurate powder charge at 2.800 OAL then slowly work my OAL length out and see if tightens my group up.
I like blc2 because of the history the price all the stories and before u crank the pressure it was shooting 1/2moa lots of controversy but this has been around forever it’s a economic fast to produce powder and has been since ww1 ! The first batch ot ran apparently lasted almost 60 yrs ! And has spawned dozens of other powders with variations. Like wc748 I’m loving that one right now cool burn low flash and cheap
Ball-C-2 has had a lot of variability in burn rates through the years. Not so much lot to lot but throughout its history as a whole. I have shot probably 50 lbs of it over the years and my notebooks show that the stuff from 10 years ago took almost 2gr less powder to reach the same velocity than a lot from present day, in a. 222 rem that's a pretty big change. I think some of the data that is in the leading books incoorperate some old data especially for powders that ahve been around a long time like BLC2.
So I'm rather new to reloading 5.56/223 and I'm testing bl-c2. What would you recommend for the charge weight for a 55gr fmj-bt.
From my limited experience, 75gr projos with 24.5g TAC will blow primers out use caution around the heavier bullets and those charge weights my frens
Have you ever done accuracy comparison on different head stamp brass
I had some Defiant Munitions 77gr otm in my Criterion barrel build flow down into the ejector bore this weekend, I assure you that’s not that bad. Mine would cut you if you weren’t careful
good job john..... i'd like to buy an econamy ar..i went too the web site of your ar and everything seems to be sold out.. politics and the news points out , these may not be avalable for long....what would you buy in uppers, lowers etc triggers.........maybe used ar and replace barrell, like you did.
Do the ejector swipes ruin the brass so they can't be reloaded again?
Jrb, Id love to hear your thoughts on your press vs the Lee turrets. I've been told more accurate ammo out of the lee's due to the sloppy head increasing alignment and concentricity?
I don't have direct experience with the Lee but I've heard good things about it! I don't think an average reloader would notice the alignment and concentricity differences you mention. I only recently got a concentricity gauge, so maybe I will run some tests in a future video.
Thanks JRB for another great video. Those magnetospeed chronometers seem a bit fussy to how they are set up and their distance from the bore line. I know you can change the sensitivity from Regular to Hi and Hi2. Which sensitivity worked best for you when you are doing your testing with the Omega?
The sensitivity settings on my V3 go from 1-11. 2 is the default and that is what I used for all jacketed bullets. For lead bullets I sometimes need to bump it up to 3.
Thanks. I have the cheap-o version of the magnetospeed that doesn't have the same fine tuning as the V3--I only get 3 choices. However, you are still a big help. I am guessing that I would need to use either regular or Hi 1. I should have bought the more expensive magnetospeed but now it's too late. I am stuck with the "sport" version for now.
The underlying technology of the sporter is the same, as far as I know! I've often wished I had bought the sporter version and saved the money! If you are having problems, I would suggest putting it on normal sensitivity (unless you're shooting lead) and focusing on the distance to the bore line. I was nervous about getting it too close in the beginning but that's what it takes! I also chased my tail a bit at first with the sensitivity but soon learned to just leave it alone at the standard setting. Does the sporter come with the alignment guide rod? If not, a dowel rod down the bore or a piece of 1/4" square metal rod from the hardware store might help a lot!
Great advice. It does not have a guide rod. I have been using my cleaning rod. Thanks very much.
What about N 140 powder
First time working with TAC and I threw 24 grains flat. Been shooting it with great results but I finally hung the magnetospeed on my whiteOak 18” mk2.5 3gun barrel is running it at 2749 average of 10 shots. With pressure so I guess it’s a reason we don’t blindly copy data of the internet. Even if it’s coming from the king
I’m sure the Magneto strapped to the suppressor had nothing to do with the accuracy issues….😬
Same thing happens when I load hot with BL-c(2)---it REALLY opens up. Sometimes CFE-223 does the same thing with my heavier loads. I had one barrel --18" 1:8 faxon actually , that loved 25.2 grns of bl-c(2) behind 75 grn hornady bthp but other than that one instance/barrel, it usually opens up BAD......it is not your gun brother. Same thing happens to me.
BLC-2 is the same as 748, I've always been told. And when I loaded .223 with 748, it shot 3-5 inch groups and I was 1.5gr under the max charge.
I think you should try BLC-2 with CCI #41's. It seemed to tighten up the group a little at 24.9 grs.
24 grains of TAC gave me pretty great numbers. Weird that max loads shoot so well.
Volume lower?
I've been screwing around with my audio a bit lately to try and help out the headphone users. I may have taken it too far in this video. Sorry about that.
BLC2 didnt work for me either recreating this over the past couple weeks lol 16lbs of Ramshot TAC on the way!
Tac and BL-c2 worked well in my 5.56 and I used tac in a 308 with 110 bullets
Your cases are sooted up. Was it from the lower grain load or was it through the entire test? Do you allow your gun to cool between groups. Not criticizing just curious. Your videos are very informative.
jon lennon no, it’s because he is shooting suppressed
In working with 7.62x51 I found that you can't push BL-C(2) very hard. Very accurate at the pressure level it likes, but beyond that.. forget it..
A hot barrel will open up groups more of a factor then .3 grains powder
Seems like you got the best SD’s of any of your loads at the upper end of TAC. On the one hand, the BH ammo didn’t have swipes or rings on the head. On the other hand, your pet load with 2520 looked to have some flattened primers, whereas these do not. Obviously, you do you when it comes to safety, but I think there is a node in there worth investigating. I’d narrow my charges to 24.3 - 24.7, trying both of these primers. It’s just too hard to discard those single digit SD’s. And I’m not so convinced those case marks are all that bad. I’ve seen worse on factory ammo, plus it could be an indication of excessive shoulder bump in your sizing die...
I want to learn so I’m asking, what about the shoulder bump can lead to the swipes of over pressure? Case sized too small? Even if it’s just using full length sizing due?
I found a load combination for blc2 that might make you like it I worked up several different loads with it an was right with agreeing with you an your grandpa that blc2 powder is trash! Until today I found that 26.3 gr of blc2 with cci 450 magnum small rifle primers and hornady 52gr bthp match bullets an 52gr Speer hp varmint bullets both shot sub half moa groups at 100yds I'm loving the powder now ! Btw I am seating at .050 off my lands for total of 2.2 COL.
First.
Load question. I have CFE223 and 220gr SMKs, what's a good load for an 18" AR10? I guess whatever is 5% under max would be fine, but I can't find much info on 220gr 308 loads
Also, do you publish your load data anywhere? I'd be interested in using some of your data (not your max loads, but stuff just short of what you really wanted.)
Hornady manual to the rescue! That's why I love the Hornady manual so much, and why you see it in just about every video. They always seem to have the weird and less common stuff covered.
For the Hornady 220gr ELD-X at 2.800" they show CFE223 37.0-42.6. 2200 fps from a 22" barrel. That should be enough to get you started. Start low, work your way up as usual.
I don't really have load data, per se. I am reading from a load manual or a powder website in each video. 300 blackout subsonics are just about the only exception, and I haven't really compiled my findings. I usually have to go back and watch my own videos to remember things!
Johnny's Reloading Bench thanks! I don't really have much area for Chronoing my loads, so I watch your videos and then go with your third lowest result usually. I'm really only doing plinking loads since I don't have anything besides an indoor range right now. I'd love to be able to shoot at a longer range every day. You anywhere near Philly? Lol
New Holland Rifle and Pistol club is in Lancaster County Pennsylvania. it's not too far from Philly. Here is the site. www.nhrpc.org
Rifles First 1:8" twist and a 10.5" barrel
G3oc3nt1c thanks! I'll check them out.
Did you find out what the primers were in the last video?
Dannie Jones
His last video also used Remington primers.
They still look closest to Remington 7 1/2 but there are some subtle differences I showed in the last video. I plan to stick with the Remingtons unless I find something that makes me want to switch back to CCI 41's.
Johnny's Reloading Bench
Lol. I was referring to the primers that were in the box that looked like the CCI 41. Ever since I found your channel I watched them like a crackhead even the hour long ones I love them. You go so into detail about reloading you pushed me into it.
Thank you for your videos
Hope you try H4895!
If you guys keep watching, I'll keep testing powders! We'll get to them all eventually. There's still a lot of bullets left in my Sierra box!
You sir are the brightness general always on rhe spot
What powder would you recommend using a 55gn bullet FMJ-BT in the 5.56?
I'm sure you mentioned it before but what scope and mount are you using? I need a scope just for testing.
Question, with a 223 wylde chamber can you load up with 556 data?
Thanks
I know this is old and you likely already found the answer to this but in case not and more so for others that might read and wonder the same thing,
Yes... That was the whole point of the Wylde "chamber" (its really just the throat that is different). It is a config derived to allow 5.56 to be fired with closer to .223 Rem accuracy but not the over pressure risk that comes from firing 5.56 in a .223 "chamber" (again, the only differences are in the throat).
When the 5.56 chamber specs were designed, it was chosen to make the free bore diameter a slight bit larger and longer for a number of reasons and it allowed for the cartridge to also be loaded to higher pressure but the sacrifice was accuracy. One of the reasons for the larger and longer throat was to reduce likelihood of dangerous overpressure situations if the inside of the barrel get wet and to prevent jams if small debris (sand and dirty and such) gets into it. The Wylde chamber (throat) is basically the .223 throat diameter (which help bring back the accuracy) but with the longer throat length and leade angle of the 5.56 chamber. The idea of it is that the concern for debris and water is not an issue in the civilian side of things unlike military side so reduce the diameter brings back the accuracy but keep the long throat to deal with the higher load pressures.
This is one thing that Johnny here used to always seem to have backward when talking about seating depth and saying that seating deeper will cause higher pressure which is opposite of what is true. While pressure does tend to rise a bit faster when you seat deeper, the peak pressure is however often lower when you seat deeper. This is why the Wylde allows you to safely fire 5.56. The longer throat is essentially the same as seating deeper.
In general, the closer the bullet is to the lands, the higher the peak pressure will be for a given load because the bullet has to engrave into the lands before it can get going down the barrel. By seating deeper (or by lengthening the throat for the same seating depth), you are giving the bullet a longer running start before it has to engrave into the lands. This then allows the bullet to get further into the barrel before enough powder had burnt to achieve peak pressure.
This can easily be tested (and has been many many times) by loading a cartridge to the point of peak pressure with the bullet touching the lands and then with that same powder charge, firing it with the bullet well off the lands and test will show that you are no longer at the same peak pressure, even as little as .010 jump can be worth several thousand PSI drop with certain combinations.
Think of it like this, if you walk up to a closed door (like say a bedroom door) and just put your shoulder into it with all the force you can, most people will not be able to bust it open. No on the other hand, stand back and take a running start at it and most people will be able to bust it open and those who do will only kind of fall into the room when the door gives way. Now stand back away from the door and take a running start at it. Most will not only bust through the door but will make it well into the room before they can slow down and stop.
All in all, it doesn't take much pressure (force really) to get the bullet to leave the case but it take quite a bit to get it to engrave into the lands and and get going down the barrel. By giving it a running start, it can get to a higher speed (remember energy is a product of mass and velocity) and thus more energy to engrave and make its way down the barrel and the further it can get down the barrel as the powder burns, the slower the pressure will rise and the lower the peak will be.
I'm not a reloader, hoping to start soon. I'm just curious if, being as the Mk626 was initially designed for a SBR, the changes in accuracy at the higher velocity might be do to you shooting them out of an 18 inch barrel. Like I said, I'm not a reloader.
Mk262 was designed for the mk12 spr with an 18" barrel
@@df4550 every article I've read stated that it was originally designed by SOCOM for their SBR.
@@charlesduncanmckinley920 www.sadefensejournal.com/wp/black-hills-ammunition/
This is the only article I was able to find stating it was designed for the mk12.
@@df4550 ok. Thank you for sharing that.
It was designed for the mk12. You and the articles you read are wrong.@@charlesduncanmckinley920
What was the powder your granddad used
The 262 is made with TAC and an anti flash additive
Source?
Source for what?
@@AWZ1287 USAF shooting team. The heavy.556 they use AR Comp
@@RoscoPColetrane source, where you heard that the mk262 is loaded with tac and antiflash
@@AWZ1287 from a member of the Air Force shooting team that I shoot nra with
Can you try a video on Wc844 and wc846, its a steal at nearly half the price of h335 and Blc2
Use a vacuum cleaner nozzle instead of banging any powder on the table to clean it. Simple Food for thought yet quick rush cleaning....m
With 77gr Berger OTM tactical and 23.9gr of TAC I’m getting 2765 out of my 20”. At 24.1gr I blew a primer.
Getting right about 2810fps with 24.3-24.4 of tac out of my 20in barrel federal 205 primers lc brass. 75gr hornady bthps
24.5 shot pretty good but had a much bigger ES and anything less than 24.0 was giving me HUGE spreads of like 100fps differece from 2665 to 2766 (could have been chronograph but it was only around that node it was nearly that bad). 24.1-24.3 was giving the best es and sd.
Have done limited testing so far but was really happy so far, shot about 1moa but couldve easily been better with a precision scope and some more patience by my part.
Will update if anyones interested, currently sorting thru a few hundred pounds of brass
JRB here's a tip in figureing out why you were getting the huge flyers in your groups, why don't you weight each and every charge by hand ? and not use your RCBS uniflow powder measure
Have you watched his videos? He throws then trickles up to exact charge weight on a scale.
@@PC-vq5ud yes I have have watched many of his videos, he has caused so many variables by changing the way he measures the powder. Using electronic scales, beam scales. He has changed different primers, different brass cases.
So the blc2 turned into blc4 inch groups. Hmm.
@16:53 "-my eye need little rest-" *see scope ocular is all way in and not adjusted to your eye... *sigh
Most of those bullets are out of bolt guns and hornady is probably using 24 inch barrel not in a AR
What was the Reload powder your granddad used
Imr 3031 and Imr 4064
If I were using TAC and my rifle got the same results as yours, I would go back and shoot from 23.9 In .1 grain increments to 24.2. Hopefuly I would find out that 24.0 or 24.1 would also give me a half inch groups. So long as my powder drop stay within that .3 grain charge zone I can just fire my my progressive press and load enough half moa ammo in a weekend to last me at least 3 to 4 months.
I got a ad on the video this time when I clicked to watch it.
The video isn't green yet. Was the ad outdoor related? For a while I was seeing a crossbow company displaying ads on some of my "limited" videos.
Johnny's Reloading Bench it was an ad trying to tell me how to make money on the internet. I can afford mansions! And then the ad was over and I was a broke youtuber again.
moparmadman me too
I got a wish ad at the start and 2 ads in the video itself
Me too, and I made sure I let it play all the way through
24.5 gr tac and change seating depth by .003 till group tightens up
I would like to see Reloader 15
I also have always had an almost unexplainable disdain for Blc(2). For some reason I just don't trust it to shoot well.😢
Ignoring the election with Johnny. I have a pound of BL-c(2) I need to use.
Holy hell, I’m popping primers and have extremely flattened primers with 24.2 seated at 2.250. I’m at a loss here.