Caliber: 9mm Luger Type: HST Jacketed Hollow Point Muzzle Velocity: 1150 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.