21 Sharp takes rimfire to the next level with the ability to utilize bullet types not commonly found in .22 long rifle, resulting in superior accuracy and devastating terminal performance. Specifications and Features:Caliber: 21 SharpBullet Type: Full Metal JacketBullet Weight: 37 grMuzzle Energy: 165 ft lbsMuzzle Velocity: 1330 fpsRounds Per Box: 100Boxes Per Case: 20