100 CountSierra Bullets has partnered with SIG Sauer to bring you the ultimate defense bullet line delivering optimal weight retention and expansion at all effective distances combined with Sierras world-renowned accuracy. The line features a stacked hollow point bullet design with an additional hollow point cavity. For the #9924″ #9925″ #9465 and #9820 a cannelure halfway up the shank locks the jacket to the core ensuring maximum weight retention and terminal expansion.