Defense Dynamics cartridges are built with the same quality cases hulls powders and primers that experienced shooters have come to expect from Fiocchi ammunition while employing projectiles proven to deliver the kind of terminal performance you demand in a personal or home defense round. - Caliber: 4.6x30mm HK - Bullet Weight: 40 gr - Muzzle Velocity: 1900 fps - Rounds Per Box: 50