Hydra-Shok ammunition has a patented center-post design and notched jacket with a non-bonded lead core. Hydra-Shok is designed to provide more reliable expansion and deeper penetration than other hollow-point projectiles used at that time. Federal Premium claims that the scored jacket and center-post design provide a "programmed" expansion. There has been much debate regarding the bullets unreliable expansion when fired through clothing or media other than ballistic gelatin. 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.