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Barrel length vs. Velocity vs. Sound barrier

649 Views 4 Replies 5 Participants Last post by  Forester
I am very interested in my 10/22 all of a sudden, and was wondering what barrel length will I get the highest degree of velocity from? Sorry, none of the sticky's answered my questions, as some of the sites were down.

Also, I have noticed you guys like to stay below the sound barrier... While I do know that the supersonic crack can interupt the flight of pellets in a high dollar pellet rifle, does the same hold true for the lowly 22. rimfire?

I am about to save and begin to mod my ruger to make a bullpup from IRONWOOD designs soon to be intoduced AUG stocks, and would want to have the flattest trajectory possible with regards to 22. LR bullet preformance. So if the 22 is heavily interupted by the sound barrier, then I wont go with the "fastest" barrel. If it is not, flatest trajectory all the way.

Get what Im saying?

I will mostly be using mid range wal mart ammunition i.e. remington, winchester, cci ect.

Thanks for the help.
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Why Go Slow

16" gives the highest velocity. High velocity (supersonic) ammo is not destabilized like pellets are. There are a whole fistful of reasons why Standard, Match, Subsonic ammos are popular with older experienced shooters. Accuracy, low noise, safety are a quick three reasons. Lots of younger shooters strive for maximum velocity. A low cost introduction to subsonic LR ammo is the CCI Standard Velocity Long Rife, I have seen it packaged as CCI Target Long Rifle also. This is prime ammo for low cost in 100 round plastic trays.
I have been told that the transition from supersonic to subsonic "knocks the bullet" destabilizing it's flight and doesn't help accuracy. That is why match ammo is subsonic, it stays more repeatable. This is just me repeating what I have heard, and is no way an arguement for said theory.
El solo is correct.
For more info on the turbulence in the trans-sonic zone, research the breaking of the sound barrier.
Yep, you don't want your bullet to drop through the trans-sonic zone on its way to the target, at least in theory. With a .22lr high-vel round, that's almost bound to happen, unless the target is really close. And there's another reason why sub-sonic rounds are more accurate: they are less wind sensitive. As far as flat shooting goes, well, no .22lr is flat shooting. With a 50 yard zero, you going to have to hold 6 to 9 inches high at 100 yards, no matter what ammo you shoot. If you want a flat tragectory, get a 22 Hornet. Good luck.
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