Barnes Suppressor Series 300 AAC Blackout 220gr JHP Rifle Ammo -20 Rounds - SUPPRESSOR SERIES is a purpose-built, subsonic ammunition line optimized for suppressor use, featuring premium Sierra projectiles loaded to Barnes' exacting standards. Barnes' subsonic loads utilize clean-burning propellants to reduce gas blowback, improve cycling in semi-auto platforms, and deliver noticeably quieter shots through suppressor-ready firearms. Features Made in the USA ;