Humidity Effects on Loaded Ammunition
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- Опубліковано 2 лис 2024
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Reloading can be dangerous. Use proper, safe techniques and slow, deliberate load workups to ensure safe maximum charges are not exceeded. DO NOT USE LOAD DATA FROM THIS VIDEO! Loads shown were safe in my rifle, but may cause dangerous pressures in yours.
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Thank you Keith, that has had me wondering for a while now, as my hunting ammunition sits around for a while before I get through a batch of 100 reloads.
Outstanding. This came up in conversation recently and I'm so glad you're the one that took the time to investigate!
.......cool little experiment & a BIG THANKS fer making & sharing, very generous of you. Thanks Again & here's to you & your great videos.
Had a friend who lives at the beach here in Orygun gave me a bunch of loaded .308 to shoot in the Classic Military matches. The ammo was terrible, lots of necks separated when fired and some were an FTF situation and the velocities were all over the map and accuract was nill. So, i pulled all the ammo down and salvaged all the bullets. The brass was a total loss full of corrosion inside and the powder which was IMR4895 was clumped inside the ammo and some I had to dig out. The powder was a dull grey/black color and had swelled from the moisture. It was a total loss other than the bullets were fine. I called my friend and told him to check his stored ammo for the same thing. I was just the other day loading some .308 with some old 4064 in the old IMR metal cans the powder looked the same and kernels had swelled 2X and had a dull grey finish and looked nothing like 4064 from a new plastic jug the dead give away was when I loaded a .308 case it filed it up darn near to the top of the neck. I looked in the can with a flashlight and the inside of the metal can was all rusty. We have huge temp. swings here in So. Orygun and the winters are wet. I'd say it's best to store Powder and Primers and even loaded ammo in a temp. controlled enviroment for sure.
Another great video. Keep up the good work!
This is when I really appreciated you doing.
Took your data and ran it through a t-test using 95% confidence and beta of 0.8. At the end of the day, with the sample size used one cannot empirically claim humidity has any effect. Though if I were conducting this study I would take a few more data points with the expectation it'll show a difference then. Seems like moisture does effect burn rate.
With that, the difference of the high humidity vs your control is VERY close to minimum difference to detect. Looks like you needed about 1 or 2 more samples from each population and the study would pass the sniff test. Any differences between the groups that are not the high humidity would require a sample size of 54.
Good stuff!
This is a nice quick test, and thanks for doing it. Seems as though humidity for loaded rounds doesn't really matter much.
This test reminds me of a test done on the Coravin, a tool that seeps wine out of a cork with a tiny needle without having to remove the cork. The Coravin replaces the wine with inert gas which supposedly keeps the wine from oxygenation.
A test was done, and supposedly wine stays like new for 30-60 days after using the Coravin. Meaning it takes quite a while for oxygen to seep through the tiny hole made in the closed cork.
This test seems very similar, with similar results.
As always great information thanks Keith!
Keith, your forays into high quality video productions that relay your technical expertise in a concise way to other shooters could be a better use of your time than unfun hacking away at F-Class. Just an aside. This data is great!
Conclusion, is that you are very consistent with load process enough that even with temp, humidity difference your variables still stay mostly consistent. So yes SD and ES with FPS all awesome with Keith on the press. Thank you for these videos keep up the nerdy content it’s not pew pew but we get to learn that’s better.
Im more curious about those consistent SDs and ESs. I can only do that once in a while and only with one set.
It would be cool to see a long term experiment to evaluate the rate of humidity transfer through the sealed case. Set up would be like this - load really dry powder into rounds, then store them in a high humidity environment. Shoot groups to get the velocity at one hour, one day, one week, one month, one year after loading. Control would be moderate humidity powder stored in a moderate environment for the same time periods.
i have 12 bore ammo witch is over 50 years old the case is paper no special storige they are still working no problem
I would think that over extended time, a period of years or decades, that this result would be more pronounced. Also, with great extremes, again the result would be more pronounced. At some point the impact would become significant but without further testing over a long period of time we certainly can't quantify it or make any projection as to a critical point or condition. I think that your test does prove that loaded ammunition is susceptible to penetration by humidity and that is significant in itself. Of course now Midway will have a run on bullet and primer sealing compound and they should send you a nice thank you card.
Nice test, thanks for the info, and your time making it. The thing that I always wonder about is, what is happening inside of the loaded ammunition, when it is exposed to sudden temperature extremes. For example, taking a gun from room temperature and walking outside, and it is instantly covered with condensation, and the same thing happens, going from outside into room temperature. I wonder if this condensation is also happening inside the ammo
What kind of powder did you use. Temperature, stable. I know you being a professional shooter it was a good proven powder. You could imagine in my days, 1960's what Temperature and humidity did to accuracy. How does humidity effect Temperature stable powder. Enjoy your videos.
Good content, thanks.
I developed a load with stable 6.5 powder 2752 fps SD 3-5 ES was under 12 always and it was the same every time I loaded them I control my temp 65-72 and the humidity 35-45% all the time I had been regularly loading this load and then shooting then a little time passed where I was not chronographing it I was just having fun I decided to recheck my load by loading some groups with a little more and less powder little more and less seating depth and it was still right on however my velocity went from 2752 average to almost 2715 increasing or decreasing powder or seating depth did not improve accuracy or SD or ES numbers I was still right in the node or maybe not because my velocity but anyways I never did figure out why it changed so drastically and why it had zero effect on my ES SD or group size 42.8 grains was where I was at same lot of brass powder and primers same lot of bullets throughout the entire time and I have a setup so that if my scale was to change you know it not to mention I use multiple scales with each powder charge including a beam scale I also calibrate my scales each time before I load I even tried bumping the shoulder more and less to see if something changed without me knowing not to mention I measured headspace surprisingly bumping the shoulder anywhere from 2 thow all the way to six made zero difference in velocity numbers whatsoever it also had no effect on group size which I find alarmingly strange it shoots sub 1/4 at 100
Seems like I should store my prairie dog rounds that may not get all shot up for a year or two in a controlled environment similar to the one they where loaded and developed in.
Great
Thanks......................... shoot what you got !!
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Month ago here in soggy north west noticed powder was filling half way up neck again on 06 .yep same weight .asked some tuber about that . He had right answer , move. To control environment . Thinking things thru like a geiser .went like this. Move wifes computer out of spare bedroom out in tack room where bridals all get slimy green. Good so far . Then she comes back in house with out tripping in the dark 😒 her hair looking like Phyllis Diller on tv. END
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