Stand 1 Armory 300 Blackout 190gr Hornady Sub-X Subsonic This is the perfect ammo for suppressed hunting. These projectiles were specifically designed to penetrate deeply and also expand, all at sub-sonic velocities. Quiet and tremendously effective, this is the sweet spot for the 300 Blackout platform! These premium rounds are loaded in new brass. Ammo in Bulk boxes is loosely packaged in a sealed bag.