The Federal AE300BLKSUP2 AE SuPower Pointressor 300 AAC Blackout 220 GR OTM 20 Rounds is a high-performance rimfire ammunition designed for suppressed firearms. Its carefully selected propellants, bullet weights, and primers ensure optimal performance in suppressed guns. This sub-sonic loading eliminates the super-sonic "crack" that suppressors can't silence, making it ideal for volume shooting. The clean-burning powders used in these rounds minimize fouling while reliably functioning in semi-automatic firearms.