Starline 300 AAC Blackout brass allows owners of this popular AR-15 cartridge to experiment with both supersonic and subsonic loads, all without worrying about the consistence of their brass. Starline 300 AAC Blackout brass was produced particularly for users of this popular AR caliber. The 300 AAC Blackout was designed to allow users to have a heavy .30-caliber projectile that could be optimized for use with a suppressor and subsonic loads. Allows for multiple reloads Sells in 100 and 500-count quantities Packaged in loose-packed bags Starline 300 AAC Blackout brass is guaranteed to be high-quality and consistent, having been produced by a company with more than 40 years experience in the brass-making industry.