Federal Premium, Hydra-Shok Deep, 40S&W, 165 Grain, Jacketed Hollow Point, 20 Round Box P40HSD1 Federal's Hydra-Shok Deep builds off the time-tested platform with design improvements that better meet modern performance measurements. Their 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.