Found a two american manufacturers making expanding subsonic projectiles for .300 blackout,seen that a few guys on the forum have AR blackouts. pretty expensive though, anyone wanna combine shipping and try some out? yell out if your keen - theres a 220gr lead core sub from .308 SUBSONIC - Outlaw State Bullets LLC and a 200 gr full copper round from .308 Maximum Expansion 200gr Subsonic Bullet - Lehigh Defense, LLC spanners?
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