The Spire Point - Recoil Proof (SP-RP)bullet is Hornady's InterLock Spire Point bullet with the unique ring that ensures the core and jacket remain locked together during expansion. The InterLock retains more mass, energy and momentum after impact and transfers that energy to the target. The exposed lead tip is flush with the jacket. The fact that it's Recoil Proof helps large calibers and also assists with premature mushrooming. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.