This Magnum Research brand of ammunition is for extreme penatration. Series Jacketed Hollow Point Caliber 50 AE Application Home Defense Bullet Type Jacket Hollow Point Bullet Weight 300 gr Muzzle Energy 1450 ft lbs Boxes Per Case 10 Bullet Coating Copper Rounds Per Box 20 Casing Material Brass Muzzle Velocity 1475 fps Unit Of Measure box