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Multi-Patented, Tumble Upon Impact™ Design Exceptional Accuracy and Terminal Performance Match grade ammunition Fort Scott Munitions™ .300 Blackout Sub-Munition TUI® ammo is match grade rifle ammunition that is designed to be exceptionally accurate. Engineered to Tumble Upon Impact®and create a devastating wound cavity, the unique, patented design of our .300 Blackout Sub-Munitions provides outstanding performance.