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 provides as much as 50 percent deeper penetration than original Hydra-Shok and competitor loads. This ammunition is new production, non-corrosive, in boxer primed, reloadable nickel plated brass cases. FeaturesPenetrates 15 inches in bare ballistics gel-the optimal depth according to FBI standards 50 percent deeper penetration than original Hydra-Shok70 percent improvement in FBI protocol scoreIconic center post design has been improved for better, more consistent expansion through standard barriers.Consistent, specially formulated propellantExtremely reliable Federal primer