Hornady Sub-X 190gr

Hornady Subsonic 300 AAC Blackout 190-grain Sub-X represents a revolutionary advancement in subsonic ammunition technology. Unlike conventional subsonic bullets that typically fail to expand at velocities below 1,100 fps, the Sub-X bullet is specifically engineered to deliver reliable expansion at velocities as low as 900 fps. This is achieved through Hornady's patented Flex Tip technology, which features a polymer insert within the hollowpoint cavity combined with long grooves in the gilding metal jacket. Together with the bullet's flat profile, these design elements ensure consistent expansion even at the reduced velocities inherent to subsonic ammunition.

The 190-grain Sub-X bullet provides an optimal balance of weight, ballistic coefficient (0.437 G1), and sectional density (0.286) for subsonic .300 Blackout applications. With a muzzle velocity of 1,050 fps and muzzle energy of 465 ft-lbs, this ammunition remains subsonic throughout its flight path, eliminating the supersonic crack that defeats the purpose of suppressor use. The heavier bullet weight provides superior penetration and energy transfer compared to lighter subsonic loads, while the expanding design ensures effective terminal performance for hunting medium game (50-300 lbs) and personal defense applications.

Performance testing demonstrates that Sub-X ammunition meets or exceeds FBI protocol terminal ballistic test requirements, making it suitable for law enforcement and defensive applications where suppressed fire is tactically advantageous. The load requires a rifling twist rate of 1:8" for optimal stability, and the ammunition is loaded into brass cases for reliable feeding and extraction. For suppressed .300 Blackout applications where silent operation and effective terminal performance are both critical, Hornady Sub-X represents the state of the art.