The Winchester Super-X 7 x 57mm Mauser 145-Grain Centerfire Rifle Ammunition has specially placed notches around the mouth that deliver fast, uniform expansion and high energy release. It is designed with 2,278 foot-pounds of muzzle energy with muzzle velocity of 2,660 feet per second. 20-round box. Made in USA. Winchester Super-X 7 x 57mm Mauser 145-Grain Centerfire Rifle Ammunition - Rifle Shells at Academy Sports
