This supersonic duty round is engineered for reliable controlled 1.8x expansion. – The supersonic SBR Elite Copper Duty ammunition features an all-copper bullet. Velocity is 1897 fps with muzzle energy of 959 ft-lbs out of a 6.75 inch barrel. – Ammo Type Rifle – Caliber 300 BLK – Grain Weight 120 gr – Qty Per Package 20 – Muzzle Velocity 1897 fps – Muzzle Energy 959 ft-lb