Hornady Sub-X Features The Flex Tip insert sits inside the bullet s hollow point cavity and works with long jacket grooves and a flat profile to reliably trigger expansion at the reduced velocities subsonic ammunition produces solving the common problem of standard hollow points failing to open below the speed of sound. The lead core provides the mass needed to maintain penetration depth despite those lower velocities while the gilding metal jacket controls expansion rather than allowing premature fragmentation. Cannelures machined into the jacket provide a positive case crimp surface which matters most for reliable feeding in semiautomatic platforms. Handloaders building suppressed .35-caliber ammunition get a bullet engineered specifically for subsonic velocities rather than a supersonic projectile simply loaded down to reduced pressure. At 250 grains and a .280 sectional density this heavy-for-caliber bullet carries the momentum needed for reliable terminal performance even with reduced velocity. This bullet gives reloaders working up quiet suppressed .35-caliber loads a purpose-built option rather than an improvised compromise. Hornady Sub-X Specifications Brand: Hornady Model: Sub-X Caliber: 35 Cal Bullet Diameter: .357 Bullet Weight: 250 gr Core Material: Lead Ballistic Coefficient: .265 Sectional Density: .280 Jacket Material: Brass Count: 100 Available At: GrabAGun