The Maxi-Mag offers consistent performance for plinking. It utilizes surefire priming technology and a jacket that seamlessly encases lead core for accuracy. Series Rimfire Caliber 22 WMR Bullet Type Jacket Hollow Point Bullet Weight 40 gr Muzzle Energy 312 ft lbs Boxes Per Case 10 Rounds Per Box 125 Casing Material Brass Muzzle Velocity 1875 fps Unit Of Measure box