I don't see much point without a suppressor. With an adjustable gas block it can shoot both sub and supersonic.
The 300 blk/whisper in a AR-15 also works. Better case fills and lower dispersion too.
The 240 grain SMKs work well in a bolt action and deliver more energy than the 220 SMKs commonly loaded for use in AR-15s. With carefully prepared handloads I gotten reliable 6" groups at 300 yards using a 16" 8T AAC barrel on a Rem 700. In an AR the breach blast is loud a 10" barrel is about ideal for subsonic. See 308Win and 300WM.ģ00 Whisper (orfireball,BLK,300-221) Probably the best subsonic available especially in a short action (bolt rifle) shooting heavy VLD bullets. (long barrel has lower velocity and more dispersion.)Ģ23 Rem - works but high case capacity is difficult to achieve low SDs. A subsonic heavy low drag bullet however can be lethal at a mile or more.ġ6" TC carbine - about 12" groups at 200 yards.Ģ8" CZ Lux - about 18" groups at 200 yards but quiet as air rifle. Without precision ammo, and a quality rangefinder subsonic shooting at over 300 yards not practical. Time of flight is about 1 second per 300 yards for most subsonics, so at 300 yards the drop is about 16 feet. Since drop is equal to 16*T^2 Feet where T is the time of flight, the drop can become huge. Minimum case capacity to achieve 1050 fps is desirable to get minimum velocity dispersion. Mass and retained velocity determine energy. Above that drag and instability increase rapidly. Practical subsonics are best with muzzle velocities around 1050 fps. According to JBM if both are fired at 1000fps, at 200 yards the 308 is traveling 160 fps faster and arrives with 146 ft/lbs more energy. Regarding equivalency between a subsonic pistol and subsonic rifle, a 210gr 308 will retain its velocity and energy much better than a 200-220gr 45 acp. 45acp) would exceed safe pressure levels because of the limited case capacity and lower pressure tolerances. Using larger high BC bullets in pistol cartridges (ie. Since there is plenty of headroom on pressure with subsonic rifle loads, the largest bullets available can be loaded to get more energy on target and retain more in flight. Originally Posted By: OldTexIf high BC numbers were important at pistol velocities, wouldn't we see a bunch of pistol bullets designed to take advantage of that, for competitions if for no other reason? Purely intuition here, but it seems a 210 slug from whatever platform will perform about the same as any other 210 slug under sub-sonic conditions - they won't fly any farther or hit any harder, not appreciably anyway. 300blk you get both mission specific loadings(sub/super). All ya actually gotta do is just use the real deal.īut you cant load 45acp to approach rifle ballistics.
I fail to see the awesomely additional benefits of jumping through those extra hoops, all to end up with 45ACP-comparable performance. IMHO, subsonic loads have pretty much always really been about duplicating handgun ammo performance in otherwise inappropriate chamberings. I mean, it's already subsonic, it can be danged accurate, and most folks get dead fairly quickly if someone doubletaps 'em with it in an effective manner. This begs the question about why folks are building subsonics on other chamberings. Originally Posted By: Greg Langelius *Well I'm thinking it's probably not all that different from a. the last two are usually found in bolt guns, so yes. I have seen it done with a 308 AR was dedicated to sub-sonic use though. Now as far as subsonic running semi-auto. better optic mounting options then on a pistol.and depending on cartridge used, better BC of the projectile which equals better range. Most people can shoot a rifle better then a pistol (I know that this may not apply to the posters on this board). now are they dropping like rocks, yes.Īs far as why one might want to go with sub-sonic in a rifle over a pistol.better platform for shooting distances further then that of the standard pistol. 210 Berger VLDs are loosing about 100 to 150 FPS velocity at 400 yards. so if a projectile with a high BC can still impact like a 45 at 400 yards. Sub sonic projectiles do not loose velocity like they do when running super sonic. Re: What is the effective range of subsonic ammunition
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