The Hornady 9mm Luger ammo utilizes a heavy 147gr XTP bullet to keep it from breaking the sound barrier while still providing efficient terminal ballistics. The subsonic expanding bullet is designed to expand at low velocities with its lead core, metal jacket with long grooves, and hollow point flex tip. The soft lead core combined with the long grooves allow the 9mm projectile to expand on impact while retaining 90% of its weight. The brass cases are designed with a positive crimp for reliable use. Hornady uses a unique powder optimized for subsonic use that has a low retort and flash signature, so you will still have a quieter experience even unsuppressed. If you are looking for reliable, quiet, and effective 9mm ammo, look no further than the Hornady 9mm Luger XTP cartridge.