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![]() A supersonic round out of a 9" barrel might be subsonic out of a 3.4" barrel. On the other hand you could have a really long rifle barrel that actually holds onto the round just a bit past the peak pressure of the burn and the round slows just a bit. A really short barrel usually has the round leaving the muzzle before the maximum amount of burn has occurred. The velocity of two identical rounds will not be the same out of different length barrels. All rounds begin to drop and slow down immediately. 22 rimfire ammo can exceed that speed out of the muzzle. The speed of sound at sea level and at 68 degrees f is about 1,125 feet per second. if your shooting at long range you want a faster bullet so that is stays super sonic longer if close range you can go sub sonic.the "prius"Ĭlick to expand. as the transition will make the bullet less accurate.īottom line accuracy. ideally you would want the bullet to be always super sonic or always sub sonic to minimize this transition. as an object in this case a bullet crosses the speed of sound there is a shock wave/ disruption in air flow around it more then normal. the reason one would choose a sub sonic round is this. there are also hypersonice bullets that are even faster then super sonic. subsonic are slower then the speed of sound and super sonic are faster then SOS. now if your going long distance you prob would like to go a little faster then 60mph. if your planing on just going down the street a Prius will do just as well as a ferrari. If find a take off Ruger hammer forged heavy barrel take offs for fair price (guy on eBay has them new, unfired all the time) they make good entry level tubes.Not all bullets are the same. Have pair of 22s at every door and three at some. Need one at every door to house and work for subs and one for faster longer reaching shots. Don't care if you have a dozen premium 22 rimfire tack drivers its never enough. ![]() Guess after tomorrow's procedure will start combing all my usual haunts for clearance stocks and bargains on premium barrels. Just need barrels and stocks as purchased a pair of Tactical Innovation receivers with picatinny rail machined as part of receiver and the hole in back so makes cleaning bore from back to front easy if drop the bolt. Tune up kits with extractors, firing pins, spring kits, extended lightweight charging handles, action screws and more. You can lighten a bolt, done it before on my mill but don't think its necessary if use correct combination of springs.īeen stuck at home three weeks now and in lots of organizing while rolling around basement in my comfortable office chair found three Ruger factory 10/22 trigger groups and enough Kidd and Volquartzen parts to build at least five or six triggers. Alloy actually expands at low velocity, whisper quiet and deadly accurate in 1:9 twist or even standard. For small pests am mostly using Eley 38 grain subsonic HPs. but if its a specialty build design it around cartridge plan to use. Also have some general purpose builds that tend to shoot anything o.k. Same with my 22 Mag 10/22s, select twist thats best for ammo (weight, plated/lead, etc) plan to use most. Not always necessary but if want maximum accuracy matching twist to velocity in rimfires will make a difference. On opposite end by slower twist barrels with special chamber for hipervelocity builds use to shoot CCI Stingers. I use 1:9 twist barrels with Bentz chambers for subsonic 10/22s. ![]() Also think about twist, slower bullets need faster twist to stabilize well. Wolff, Kidd and Volquarzen sell spring kits to tune your bolts resistance to ammo used. Used a lighter bolt on both but not lightweight. ![]() Have two 10/22s built to shoot 38 grain subsonic that are 100% reliable. ![]()
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