Experience unparalleled performance with Sub-X® (Subsonic — eXpanding) bullets, engineered for maximum impact without the noise! Specifically crafted for deep penetration at subsonic speeds, Sub-X® boasts a lead core and distinct long grooves in its gilding metal jacket. Its flat profile, coupled with the patented Flex Tip® insert within the bullet’s hollowpoint, ensures consistent expansion even at low velocities. Enhanced with cannelures for a secure case crimp, Sub-X® is the ultimate choice for semiautomatic firearms.