Sierra bullets, in collaboration with Sig Sauer, introduces a premier line of defense bullets engineered for optimal weight retention and expansion across all effective distances, while maintaining Sierra renowned accuracy. This line incorporates a stacked hollow point bullet design, featuring an additional hollow point cavity. A locking groove is integrated to ensure controlled expansion and maintain high weight retention. The new No. 9947 147GR JHP is a heavyweight bullet designed to achieve subsonic velocities in cartridges such as the 9x19 (9mm Luger), making it an ideal choice for use with SBR-style firearms.