Відео

Thank you for the excellent, informative video.

Does the modeling software take spin into account?

James, if you recover a fired .22 LR bullet from a deep water tank, the base is bulged out to meet the barrel groove diameter, by means of sudden application of high pressure gas ahead of the chamber. So, the bullet base "in flight" does not look like it does, before firing. Certainly, full depth land impressions can be observed almost all the way to the rear of a fired .22 LR bullet. If Eley are attempting to mimic a boat tail bullet shape after firing, the rifling spin requirements for stable flight will exceed the typical 1:16 for a .22 LR barrel.

Very well done... and the best thing, besides seeing that the bullet shapes are already optimized, was seeing that the increase in the barrel reduced the speed of the bullet, making the 16" long one better ... ! 😮❤

The heel obturates and fills the bore entirely once fired, we recovered several after I broke my last record with them at 1325 yards.

I am using Lapua because of the proximity of their test facility. Their bullet is a bit more pointed.

Dear sir: the stupid music only detracts from your material. I couldn’t watch very long.

Thank you.

very interesting and great and understandable explained 🙂

TOP !!

An Excellent presentation - very informative. Have you verified the uncertainties affecting your chrono measurement. From a metrological perspective, your measured results cannot be precise. There must be uncertainties associated with measurement taken alone (let alone the total uncertainties at the measurement instant form all sources.) eg environmental, cartridge related, rifle related.

I think this is the video that was mentioned previously . Im sure everyone will love this video! Thanks for the recommendation ua-cam.com/video/BPwdlEgLn5Q/v-deo.htmlsi=ANSbgmqTHcFIIXgH

Part 2? Anything missing that you want to add ?? Really enjoyed this video! Thanks!

Very interesting video Mr. Conger please make more on other calibers!

I found your discussion of comparing modelled results to single data point physical results very interesting. That is quite similar to the way naval architects design ship hulls (my profession for a number of years). We couldn't afford to run models of all the proposed designs down the tow tank, so we used a combination of the results from a standard design series (some of which are very old), and a single design we felt was in the ballpark, as the basis for making small tweaks here are there in the shape of the hull.

laminar flow is a thing.. who knew..

The upper bullets are pulled directly from the unfired cartridges. Note the shape of the drive bands and crimp line. The lower bullets are recovered 22lr projectiles of the same type. Swaging and obturation move the lead to fill the bore and create the needed seal. lh3.googleusercontent.com/pw/ACtC-3f8bNE2HBzhJbHY-NcLKFH0qmOHUdz3yrHTUCcWybZJk1SzZIWEOIqwrGzqj86XGzwqHhYWrMOwSLrXe6yhg-71eV0mp5wkFaYrpJKkwF06ZK_yDdhw8s1DKh4Kzbaj-3CW1SzqvGVDmlGJNU5i3VAF=w595-h356-no?authuser=0

You should verify the shape/profile of a fired 22lr bullet. The obturation of the heel and swaging by the leade changes the shape from the heeled projectile you show, to a round nose cylinder, with no diameter change at what used to be the crimp line. Bullets recovered from a snowbank, water tank, poly-fil trap all show the crimp line and smaller diameter heel have been reshaped to a uniform diameter from the leading edge of the drive bands to the cupped heel.

Lovely stuff. Thanks for sharing. 🖖

A lot of .22 air rifles are shooting just before that transonic area you referenced. I have several that shoot around 650 to 700 feet per second. It would be very interesting to see a similar video testing out various shapes and weights of pellets for .22 air rifles.

The reduced diameter heel at the back somewhat mimics back diameter reduction in Spitzer bullets, which are low drag. As of flattish nose, that is counter intuitive, BUT General Purpose bombs used by Russians lately have *flat* noses, or look literally semiwadcutter. Contrary to all other bombs which try to be aerodynamic. Not sure why, maybe free fall trajectory is more predictable

As someone who builds pcps as a hobby this video is absolute gold. Thanks for making this.

That P47 doesn't have a blunt nose, it has a great big gaping hole for the air to pass through and cool the engine.

Quite interesting, thanks.

Great video. Clears up a lot of questions.

Great vid - looking forward to more like this.

Nice presentation. I would also like to see the vorticity maps and correlate them to the drag. Thank you!

Boeing 747 max cruise speed was mach .82. fastest commercial cruise speed on non supersonic airliner.

Loose the background music very annoying in the beginning...

Good stuff. I know that you are focusing on long-range target ammo, but I would love to see some basic comparisons with more standard 22 LR bullet profiles like Stingers or Punch. Ubuntu user. I'll checkout Freecad. Thanks

Eley match are over priced and not very good

Thanks Very technical but you explain well enough to follow.

Great video. But please lose the music.

Hey, look at that! Another Linux user. You've got my subscription!

Thank you, very informative and interesting.

I have been reloading 22lr and researching the function of them for the past 8 yrs. Your cad drawing is not quite accurate. The reason there is hollow base on the 22lr is so that the pressure (once the bullet leaves the cartridge) obturates the heel of the bullet into the rifling. Which actually expands the heel to the same diameter of the bullet. The heel picks up the rifling just like the bearing surface of the bullet. This leaves a nearly flat base in flight. They still have some of the hollow but not as much as an unfired bullet. I have learned a lot about the function of 22lr. I have some videos (very poor quality) of it on my page here.

Please model pellets!

He's not old enough to be my grandpa but it felt like " come er young fella and let me teach ya how amazing this thing is."

Thank you for this very interesting video. Best regards :)

Hi James, thanks for sharing your excellent work. It would be great if you could please run a simulation for the 22LR CCI Standard Velocity 40gr (to be used as reference). I have all Brian Litz books, program and Kestral. He should start to include 22LR dope for us long range rimfire shooters.

Spin rotation is also dragging air around the rotational axis although minimal it factors in.

The ideal shape for supersonic projectiles should be the sears haack body, so good modern bullets are some kind of extended ogive with a boat tail, and have drag coefficients that are pretty close. Similarly there should be an ideal shape for transonic and subsonic projectiles, most likely something airfoil and supercritical airfoil shaped. I suspect that that Eley Match is getting pretty close to a stepped supercritical airfoil.

Great video, first one I have heard of about the 22 lr. Thanks.

Stabilizing "pointy" bullets has been achieved with 8.5 Blackout. They do this with increasing rifling to a 1 and 3 twist rate. I wonder if doing something similar with .22 could be modeled?

Great idea for the video, but I have a few pieces of technical advice: bring your mic way closer to the sound source (your mouth), plus you might also consider opening your mouth while speaking. That helps like a dream.

With the designs that have a steep increase in drag as it goes supersonic, it is possible to take advantage of this to reduce vertical dispersion at long range. It is sometimes called "Mach trimming". The bullet is loaded to just above the critical mach number. This way, the bullet reliably slows to its max subsonic speed soon after leaving the muzzle. Believe it or not, this often produces more uniform bullet speeds downrange than trying to launch each round at precisely the same (subsonic) muzzle velocity.

The barrel length data shows that the pressure of the small powder charge drops below barrel friction beyond the 16" barrel for these loads. I always thot so... But I only have my 5.5" target pistol and my Ruger 10-22 18", so had no way to test that. Very interesting show. Eons ago, Herters made some coke bottle shaped 22 bullets - it was known that wasp waisted aircraft had lower drag... It might be interesting to model them vs. say Hornady spires vs. Sierra spitzers. They shot well in my 222 Rem. IF they maintained shape in the barrel, they would have less barrel friction, too. I thimque I may still have a few around someplace. I may load some to compare BC's with my Lab Radar...

Round tip is not scary. Pointy is scary.

Good example of something where the whole is greater than the sum of its parts.

Aside from the spectacular research, and very even keel presentation, I have a great deal of respect for this gentleman for using a Shure SM 58 microphone! Highly underrated tool. Well done. Also, maybe you've already done this, but I'd love to see some 40 Smith & Wesson ballistics content regarding what characteristics a round would need in order to deliver 500 FPE from a 4 inch barrel.