Caliber: 9mm Luger +P Grain: 124 Type: Hydra-Shok Jacketed Hollow Point Muzzle Velocity: 1200 Federal Premium introduces the HST Jacketed Hollow Point - high performance duty ammunition. Each HST offers consistent expansion and optimum penetration for terminal performance. The specially designed hollow-point tip won't plug while passing through a variety of barriers. The tapered jacket wall thickness is engineered for 100% weight retention and large expansion.