Hornady Sub-X Features The Hornady Sub-X bullet is engineered specifically for subsonic performance using a patented Flex Tip insert seated in the hollow point cavity to trigger reliable expansion even at velocities as low as 900 fps. Its lead core construction paired with long grooves in the gilding metal jacket helps promote consistent controlled expansion despite the lower impact velocities typical of subsonic loads. A flat profile aids in creating a wide wound channel while maintaining the penetration needed to meet FBI protocol terminal ballistic test requirements. This design lets reloaders build genuinely effective subsonic 7.62x39mm loads rather than relying on standard supersonic projectiles slowed down. Cannelures machined into the jacket provide positive case crimp which is important for reliable feeding and function in semiautomatic platforms chambered in 7.62x39mm. Designed to fit feed and function across a variety of firearms including gas-operated semiautomatics this bullet gives reloaders confidence that their handloads will cycle properly. At 255 grains with a .3115 diameter this projectile is matched specifically to 7.62x39mm bore dimensions for optimal accuracy. As component bullets these are intended strictly for handloading and are not a substitute for factory-loaded ammunition. Hornady Sub-X Specifications Manufacturer: Hornady Model: Sub-X Caliber: 7.62x39mm Bullet Diameter: .3115 Grain: 255 gr Bullet Type: Subsonic Bullet Material: Jacketed Lead Rounds Per Box: 100 Available At: GrabAGun