Hornady Subsonic Ammunition is designed for accuracy and performance below the speed of sound. Each XTP Bullet has a swaged core and drawn copper jacket to ensure uniform expansion and in-flight stability. One of the great things about the XTP bullet is reliable performance, it features controlled expansion where six serrations divide the bullet into six symmetrical sections. These sections weaken the jacket to allow controlled expansion at low velocities. The XTP bullet is really known for its stopping power. They were designed from the beginning to expand reliably at a variety of handgun velocities and deliver deep, terminal penetration with every shot. Performance of the Hornady Subsonic load meets or exceeds FBI Protocol terminal ballistic test requirements. This ammunition is new production, non-corrosive, in boxer-primed, reloadable brass cases. Features:• Loaded with unique powders optimized for subsonic use, the low flash signature is ideal for both suppressed and unsuppressed performance• Bullets feature a cannelure for a positive case crimp for use in semi-autos• Designed specifically to fit, feed, and function in a variety of firearms