The Maxim Defense 8.6mm Blackout ammunition features 235 grain copper bullets with advanced TUI (Tumble Upon Impact) technology specifically optimized for short barrel rifles to deliver superior terminal ballistics.Maxim Defense 8.6mm Blackout Ammunition - 20 rounds per box235 grain copper projectiles with TUI technologyTumble Upon Impact design effective down to 500 FPSOptimized for short barrel rifles (SBRs)Ballistic wound cavities exceed expanding and fragmenting projectile standardsPartnership with Fort Scott Munitions for enhanced performanceEngineered to address the velocity and terminal ballistic challenges of short barrel rifles this ammunition excels in close-quarter encounters while maintaining effectiveness at lower velocities.