Federal Premium Hydra-Shok has proven itself for self-defense since 1989. Hydra-Shok Deep builds off the time-tested platform with design improvements that better meet modern performance measurements. The bullet features a more robust center post and a core design that penetrate to optimal depths through the barriers most commonly encountered in self-defense situations. Ammo Specifications Caliber: 45 AUTO Bullet Weight: 210 gr Bullet Style: Hydra-Shok Deep Hollow Point Muzzle Velocity: 980 Ballistic Coefficient: 0.16 Use: Personal Defense Quantity: 20 Rounds per box