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Several smaller ammo companies load subsonic rounds for the. bullet at 1010 fps) Allegiance Ammunition (100 grain at 975 fps) Custom Reloads of Dallas (55 gr. The heavier-bullet loadings like the 75-grainers will generate 200 foot-pounds of energy, making them in the same power class as a. 38 special standard-pressure load (either 158 grain or 125 grain). The heavier bullet loads, combined with slower speeds (the bullet spins at lower RPM's) means you need a fast twist barrel. But don't pretty much all AR pattern rifles made in the last 15 years come with 1:9 or faster twist? And even the bolt-action guns tend to be 1:10, which is probably fast enough to stabilize up to 62 grain subsonics, and maybe the 75 or 77-grain boat-tails too. They probably will not cycle the action as a semi-auto, but if you need more than one quiet shot, you can rack the charging handle manually. For most hunting or pest control applications, you only need one shot most of the time. For plinking at the range, it's no big deal to cock the rifle in between shots. For tactical applications, against bad guys with their own guns, you'd just have to accept that you only get one fully suppressed subsonic shot from deep concealment. After that, if you miss, you have the choice to either slink away quietly or cock your gun and hope the bad guys didn't hear you do that or see your arm movement. 22LR bullet initially moving at 1040 f.p.s. (just barely still subsonic) is NOT like a 75-grain boat-tail. 223 bullet moving at the same muzzle velocity. 223 round is nearly twice as massive (weight), and this will strike with a lot more kinetic energy, even at the exact same velocity. (180 ft/lbs versus 130 ft/lbs in example above).Īlso, the sharply-pointed. 223 bullet will have a much better ballistic coefficient, and thus will retain its velocity better. At 100 yards the difference is small (about 6%), but if you take a 150 yard shot, the. 22LR subsonic round-nose will hit at 930 f.p.s. (see the chart from the Federal ammunition company at this link: ). 223 with a 75 grain boat-tail subsonic will still hit the 150-yard target at 960 f.p.s., while the. and only a powder-puff impact with 57 ft. 223 subsonic has 20% more velocity at 150 yards than a. 223 relies on muzzle velocity for terminal ballistics. I have also thought about cutting a few coils off the standard buffer spring to see if this helps.I've done a fair amount of shade tree ballistic testing with shorter barrels, lower velocities, twist rates, and various weight projectiles up to 75gr.īottom line is that heavier rounds can only compensate for so much, and running the velocity down to 1000 fps or so, even with a 75gr round, makes for a much less lethal round. I need to find a reduced spring that I can try. I am leaning towards playing with the buffer spring and/or buffer. The idea of changing out the bolt carrier and gas block and such is not an option. So, my solution needs to be simple and easily available to all shooters. What are some options I can do to help aid the cycling? My goal is to have a subsonic round to sell to any and all shooters who have an AR-15 with 16" barrel and a 1:8" or 1:7" twist barrel shooting suppressed. When I get my speed up just above 1100 fps (supersonic speed), it will cycle and the bolt will lock back on an empty mag. It will eject the spent case, but the bolt will not lock back on an empty magazine. When I get down to the speed I need, I can not get the bolt carrier to fully cycle the next round. I have a working subsonic load with both bullets in a standard M4 type, 16" barrel shooting suppressed. I am working with some custom 87 grain and 94 grain flat base, HP bullets that will stabilize in a 1:8" or 1:7" twist, 16" barrel. I began working on my 223 subs that will cycle an AR.
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I need some help guys! I know ammo very well, but I don't know the inner workings of an AR as well, like some of you do.