300 AAC Blackout – 190 gr Sub-X Subsonic – Hornady (80877) – 200 Rounds

The 300 Blackout earned its reputation as a quiet, suppressor friendly cartridge, and subsonic 300 BLK ammo is what makes that possible. The Hornady Subsonic 300 Blackout 190 grain Sub-X (MPN 80877) comes in a 200 round case, a practical supply for verifying function with your suppressor, practicing and hunting with one consistent load.

The Sub-X bullet solves a common problem with subsonic ammo: getting expansion at low velocity. Standard hunting bullets often need higher speed to open up, while the Sub-X uses a flexible polymer tip designed to expand at subsonic speeds. Hornady rates this load at 1,050 fps with 465 ft-lbs of energy and a ballistic coefficient of .437. Keeping the 190 grain bullet below the speed of sound avoids the supersonic crack, so a suppressed rifle stays much quieter while still delivering a bullet built to expand.

This subsonic 300 Blackout ammo is suited to suppressed hunting of hogs and deer at moderate range and quiet home defense. It runs in AR-15 uppers chambered in 300 BLK, the SIG MCX and bolt action rifles like the Ruger American Ranch. Subsonic loads may need a suppressor or a tuned gas system to cycle reliably in semi-automatic rifles, so test your setup before relying on it. For anyone who shoots a suppressed 300 Blackout, a 200 round bulk case of Hornady Sub-X lets you confirm function, zero and still keep a solid supply for hunting season.

Every round is new production, not reloads, made in the USA by Hornady. The cases are brass with boxer primers and are reloadable for handloaders who want to keep their 300 Blackout brass. The ammunition is non-corrosive, so normal cleaning is all that is needed after shooting. The bullet is a 190 grain Sub-X with a flexible polymer tip. The factory case contains 10 boxes of 20 rounds for a total of 200 rounds of 300 AAC Blackout ammunition, packaged by Hornady for easy storage.