Understanding Firearm Ballistics by Robert Rinker. These are things he has verified, but I have not. This is all info I have got from reading a book on ballistics and is for the 22 LR, I want to do some tests with the crono to verify, but the guy who wrote the book is an expert, not just net talk. No idea why the 1080 figure was the one picked, but it's been the published standard for a long time. Jerold, the 1080 figure is when the temp is approx 30 degrees F, when you get to about 70 degrees, the speed goes up, temp has the biggest effect on the FPS. The effects of the pressure on the bullet are not sudden just at whatever the actual FPS for the temp and other conditions, they happen in a range, so the lower the FPS the sub sonic bullet exits the muzzle within reason, the better, the less the bullet is affected by the changes that occur between sub sonic and supersonic. The higher FPS is really a good thing for most, especially the rifles with the 16" barrels. You are right, there is much more to it than what is published. The CZ Ultra Lux is along the lines of what I'm refering to, may or may not be the best rifle, but the design is right in there. Having the money, I'd start with a rifle with a good action and put a match barrel on it, one about 26" long at the most. There’s a massive amount of variety in the rimfire world, and some ammo is better at certain tasks than others. I'm not going to get into which rifle is the best. Best Backwoods Defensive Ammo: Aguila 60-Grain Sniper SubSonic Best Short-Barrel Defensive Ammo: Federal Punch Personal Defense 29-Grain Never have you had so many ammo options. For that reason, if I'm looking for best accuracy at sub sonic speeds, no matter which rifle I choose, I want one that shoots at a lower FPS within reason to exclude the effects of changes in the pressures on the bullets when going between sub and super sonic. The effects of speed on a bullet don't happen sharply at exactly the speed of sound. It was a read that very much made one think. I was just reading a good piece in a book on ballistics and the author was talking about sub vs super sonic in 22 LR, the cut off may be the speed of sound, but the pressure on the bullet does not change exactly at the speed of sound, it builds or drops off over a range of FPS, for that reason I would want a combo that sent my bullet out of the muzzle lower than the speed of sound in order to get the least change in flight.įor that reason I want a longer barrel that will give slightly less FPS right from the muzzle. To insure a bullet stays subsonic, I'll pick a longer barrel, The chamber, barrel and gun do pick which ammo they like the best. They're out of stock right now, but the owner of OCL said they're built and waiting on the ATF Form 3's to clear, so they should be getting them on the shelves within the next week or 2.I think it's importnt to make sure the bullet stays sub sonic, a shorter barrel may increase the velocity some because the ammo was tested in a longer barrel and many sub sonic ammo's are right on the line between sub and super sonic. Plus, you can also use it on all your other rifles, as well. 300 BLK suppressor, the Hydrogen-S 7.62 is the best one I've found. It's ridiculously lightweight and pretty much hollywood quiet. For example, the Sandman-S is a great can, but it only has 5 baffles, so it does have some first round pop, and it's much louder than my 7" precision rifle cans that have many more baffles, like my Otter Creek Labs Hydrogen-S 7.62, which has 9 baffles and is solid titanium. The quality of the suppressor you run will make a HUGE difference. Anything longer would be running into diminishing returns, and negating the purpose of the round.Which is for good performance from shorter barrels. It already shines in a 10.5-16" barrel, like it was designed to. 300 BLK with anything more than a 16.5" barrel. Personally, I think it would be a waste to build a. 308 Win with the same subs and same suppressor. 308 Win with subs is quieter than my 16".
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