Federal Premium Personal Defense Hydra-Shok Ammunition is an excellent choice in self-defense. Unique center-post design delivers controlled expansion for accuracy when needed most. The notched jacket of the Hydra-Shok Hollow Point transfers energy efficiently for maximum penetration. Compared to standard loads, Federal Hydra-Shok Ammo has an increased muzzle velocity and energy. Powerful penetration and stopping power have reduced recoil and provide the quality of Federal Premium bullets. Non-corrosive, boxer primed, and reloadable brass cases for durability and accuracy in every event. 20 rounds per box.