Modern components and generations of ballistic know-how come together in the Hornady® InterLock® SP American Whitetail® Rifle Ammunition. Inner grooves are placed specifically to weaken the upper section of the jacket for consistent, controlled expansion. The one-piece core retains more mass and energy. The cannelure design of the InterLock SP American Whitetail ammo works with the Interlock® ring so the jacket and core remain together during expansion.