Federal Premium, HST, 9MM, 124 Grain, Jacketed Hollow Point, 20 Round Box P9HST1S Effective self-defense requires ammunition that provides consistent expansion, optimum penetration and superior terminal performance. HST(R) delivers. That's why it's already the duty load of choice for law enforcement officers throughout the world. Its specially designed hollow point won't plug while passing through a variety of barriers and the bullet jacket and core hold together to provide nearly 100 percent weight retention through even the toughest materials.