Super-X ammunition has provided exceptional quality and outstanding performance for all types of hunters and shooters who rely on its time-proven dependability backed by legendary excellence. Series Rimfire Ammunition Caliber 22 LR Bullet Type Power-Point Copper Plated Bullet Weight 40 gr Muzzle Energy 145 ft lbs Boxes Per Case 20 Rounds Per Box 100 Casing Material Brass Muzzle Velocity 1280 fps Unit Of Measure box