Hornady 300 Blackout 190 gr Sub-X (80877)  

Subsonic Handgun utilizes tried-and-true XTP® bullets that expand reliably at subsonic velocities. The Sub-X bullet used in Subsonic Rifle features a lead core. Long grooves in its gilding metal jacket combine with the bullet’s flat profile and the patented Flex Tip® insert within its hollow point cavity to help it expand reliably at low velocities.