I have a Wilson Combat 300blk upper -- 11.3" barrel with a 1/7 twist. I don't find blackout ammo to be as accurate as its 223 counterparts. Of course I've only shot supersonic ammo in my 223s. Buddies I compete with who have 300blk ARs also find accuracy challenging. The best accuracy appears to be with match-grade supersonic ammo in the 110 grain (like Hornady Vmax) to 125 grain (HPBT match) ballpark.
I've tried only a couple of subsonic loads in my upper. Ball ammo only -- not the match loads that use the heavy AMax and SMK bullets. For ball subsonic ammo out to maybe 25 yards, the blackout isn't all that more accurate than my match-grade 45s (Ed Brown, Kimber, Sig) with ball ammo. Further our, the optics on the blackout upper from prone position produce noticeably better results than iron sights on a handgun held off-hand. No surprises here.
In theory, my Wilson's 1/7 twist rate allows the use of a wide variety of bullet weights and types, both subs and supers. The Virtus' 1/5 twist rate is really fast. I didn't realize any company produced such a fast twist blackout barrel. The Virtus has to be designed with subs in mind -- the twist rate may be too fast for many supersonic bullets.
I use a can for all my 300blk shooting. For me, any AR being suppressed makes sense.
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