New 5.56 NATO Frontier Cartrigdes feature Hornady bullets. State-of-the-industry loading techniques and quality control procedures ensure the reliability of every Frontier Cartridge round. Frontier Cartridge offers ammunition configured for a wide range of shooters and applications, everything from plinking, target shooting and hunting to law enforcement training and self-defense. In addition to Hornady bullets in a variety of offerings, Frontier Cartridge features brass cartridge cases and military-grade boxer primers and propellant. Product Specifications Caliber: 5.56mm NATO Bullet Weight: 55 gr Bullet Type: Full Metal Jacket Muzzle Velocity: 3240 fps Muzzle Energy: 1282 ft-lbs. Sectional Density: .157 Ballistic Coefficient: .243 (G1) Quantity: 20 Rounds per box