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

Benefits of subsonic bullet