Caliber: 22 Winchester Magnum Rimfire (WMR) - Rounds Per Box: 50 - Bullet Type: Flex Tip Expanding - Bullet Weight: 45 GR - Muzzle Energy: 289 ft lbs - Muzzle Velocity: 1700 fps - Boxes Per Case: 40 - Unaffected by thick and heavy clothing the 45 gr. FTX bullet delivers superior controlled expansion and terminal ballistics comparable to the 380 Auto Critical Defense load. It offers superb accuracy and devastating terminal performance in a a rifle. Optimized for short-barreled firearms the 22 WMR features clean burning propellants with low flash and blast to help protect night vision.