I do a lot of subsonic reloading. Such as 300Blck, 9mm, .458SOCOM, .308, .44 special, etc.
Mostly bolt action but have AR15 set up specifically for subsonic in .300black, 9mm, .45acp, and .458.
I never tried loading subsonic .223 for an AR15.
But if I did, I would use a heavy ( long) bullet like a 77 grain, pistol powder like H110 with filler, and preferably an adjustable gas regulator. I would experiment with lighter buffer weights. Possibly a silencer to add backpressure.
I would expect a lot of failure to cycle, failure to feed.
Also bullet keyholing.
Good luck and please update if you find a workable solution.
Last edited by Ready.Fire.Aim; 05-09-21 at 21:08.
"Jill, if there's ever a problem, just walk out on the balcony ... take that double-barrel shotgun and fire two blasts outside the house,.." VP Joe Biden Feb 19, 2013
Bookmarks