Liberty Ammunition's Silverado Lead-Free rifle catridges are monolithic, deep-cavity, fragmenting rifle rounds, the world's first high-performance .223 Remington rounds that deliver superior lethality. Made of nickel-plated copper bullets, the rounds leverage Liberty's proven and patented technologies to deliver superior range, accuracy, and terminal effect. The result - stopping power of more than 1100 ft. lbs and fragmentation of up to 9 pieces while achieving maximum effectiveness.Specifications:Caliber: 223 Remington/5.56 NATOBullet Type: Hollow Point Boat TailBullet Weight: 55 GRMuzzle Energy: 1100 ft lbsMuzzle Velocity: 3000 fpsRounds Per Box: 20Boxes Per Case: 10Casing Material: Nickel-Plated Brass