Caliber: .300 Blackout Type: Elite Match Grade OTM Muzzle Velocity: 1000 fps Muzzle Energy: 488 ft-lb Quantity: 20 rounds The Sig Sauer 300BLK Match Grade Centerfire Rifle Ammo is designed to bring out the best in today's high-performance AR rifles. The ammo features match grade brass cases and will run through standard 223 Remington/5.56mm NATO components including magazines. These Supersonic rounds feature Sierra Matchking projectiles for superior accuracy, increased downrange terminal performance, and low noise level characteristics.