Hornady Subsonic, 7.62X39, 255 Grain, Subsonic eXpanding Projectile, 20 Round Box 80787 Hornady Subsonic Ammunition designed for accuracy and performance below the speed of sound now comes in both rifle and handgun loads. 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 HollowPoint cavity to help it expand reliably at low velocities.