The Lehigh Defense Controlled Chaos .308 Winchester, 152 grain. Caliber: .308 Winchester Bullet: 152 gr. Lehigh Defense Controlled Chaos Case: Lehigh Head Stamp Velocity: 2800 FPS Muzzle Energy: 2646 ft-lbs. Test Barrel Length: 24" Quantity Per Box: 20 Mfg: Lehigh Defense, Llc