Caliber: .45 ACP Grain: 230 Type: Hydra-Shok Jacketed Hollow Point Federal Cartridge Hydra Shok. Premium Hydra-Shok helped define specialized law enforcement ammunition more than a decade ago. The amazing thing is, it's doing the same thing today. Hydra-Shok has been continually improved through the years and remains the most popular choice for accuracy, expansion and penetration. Its notched copper jacket controls penetration to satisfy even the most stringent testing requirements. The unique center-post hollow point design provides controlled expansion and extremely efficient energy transfer for incredible ballistic performance.