See our ammunition write up on Tactical Gun Review:
220 Sierra Matchking loaded subsonic @ 1050 FPS. Brass is once-fired Lake City (LC), 5.56 brass cleaned, sized and cut down to 300 Black Out spec. Primed with CCI #400 small rifle primer. Standard 1:8″ twist or faster (1:7″ twist) will stabilize this bullet.
100 rounds per order