The Hornady Subsonic Rifle Ammo 300 Blackout 190 gr Sub-X offers the Sub-X series bullet technology built to deliver reliable expansion and deep, controlled penetration for hunters and shooters who run suppressed or unsuppressed rifles, and its ideal for 300 AAC Blackout platforms where subsonic performance is desired; the 190 grain Sub-X bullet features long grooves in the gilding metal jacket and a flat profile that promote expansion, a lead core with a cannelure for positive case crimp in semi-automatic feeding, and achieves impact velocities around 10201050 fps with roughly 465 ftlbs of muzzle energy, meeting or exceeding FBI protocol terminal ballistic tests with 1618 inches of penetration and over 90% weight retention in ballistic gelatin. Use this Hornady load for stealthy late-season hogs, medium game at shorter ranges, suppressed precision work, and training where reduced report and low flash are important; the powders are optimized for subsonic velocities to lower muzzle blast and flash signature, and the brass-cased ammunition offers consistent chambering and extraction. If you want a proven subsonic 300 Blackout option for hunting, range work, or suppressed operations, the Sub-X 190 gr provides dependable terminal performance and controlled expansion when it matters.