223 load question

[rlw]

I am in the process of building another ar15 from the ground up and will be done with the gun next week and am finally maning up and buying a suppressor for this one. When i get that (in what will seem like 5 years from now) i was wondering if anyone has worked up a subsonic load with 90gr smks that may be able to cycle the bolt?

heres the specs of the upper
16" woa barrel 1-7" twist and mid length gas tube
pri adjustable gas block
young nm bcg

thanks in advance
(im going to have this in the gas gun and reloading section as i feel it fits in both)

 

[M25BeastShooter]

Re: 223 load question

Not a 90 gr but I'm running 10.5 grains of 2400 over a 75gr BTHP in a 16" 1:9 twist with a AAC M4 2000 suppressor. 1/2 group at 50 yards cycles with the suppressor.

I use it for crop damage deer kills in a orchard that's close a development. Real quiet and head shots 1 shot 1 kill

 

[former naval person]

Re: 223 load question

Just be careful on the reduction. Not too hard to do the subsonic process with lead bullets, but stick a jacketed bullet in the middle of the bore and you have a problem. I'd suggest loading higher than subsonic with Unique, and dropping it a .2 grains at a time till you get just subsonic and QUIT. You can try that with M25's load...just quit when your chronograph reads 1100 or so. With lead you can get real quiet...but I guess you don't want to cycle by hand. JMHO