Hydra-Shok
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Hydra-Shok is a brand of ammunition made by Federal Cartridge. It was originally patented by bullet designer Tom Burczynski. Hydra-Shok features a unique, patented center-post design and notched jacket. The center post acts as a simple wedge when tissue enters the hollow point resulting in maximal expansion of the bullet, and improved energy transfer. The Hydra-Shok round is available in various calibers; 9mm, 10mm, 32 ACP, 380 ACP, 38 S&W Special, 357 S&W Magnum, 40 S&W, 45 ACP, 45 GAP, and 44 S&W Magnum. In ballistic gelatin the bullet typically displays very rapid expansion resulting in a larger but more shallow wound channel than would be typical from most other bullet configurations in the same caliber and of similar weight. Federal markets a line of personal defense ammunition utilizing the Hydra-Shok design that is excellent for self defense applications whether law enforcement or civilian.
In the film Training Day, starring Denzel Washington (Detective Alonso Harris) and Ethan Hawke (Officer Hoyt), there is a scene in which Dr. Dre is pointing a gun at Hoyt's head saying, "I would gladly put a Hydra-Shok in your choirboy's head."