300 AAC – 220 gr OTFB – Remington (28430 / S300AAC4) – 200 Rounds

The 300 Blackout was designed to run quietly behind a suppressor with heavy subsonic bullets, and that is exactly what this load is built for. This listing is Remington 300 AAC Blackout 220 grain open tip flat base subsonic ammo, MPN 28430, sold as 200 rounds for suppressor owners, short barreled rifle builds, and shooters who want a quiet 300 BLK range load.

Remington rates this load at 940 fps with 432 ft-lbs of muzzle energy. Staying under the speed of sound removes the supersonic crack, so a suppressor can deliver its full benefit. The heavy 220 grain bullet keeps momentum high at low speed, which helps it carry energy and resist wind better than a light bullet moving at the same velocity. An open tip bullet like this is primarily for target use. Expect a steep trajectory beyond 100 yards and zero your optic with this exact load.

This ammunition fits firearms chambered in 300 AAC Blackout, including AR-15 rifles and pistols in 300 BLK, the SIG MCX Rattler and Spear LT, Q Honey Badger, B&T APC300, Ruger American Ranch, and CZ 527 and 600 Mini. A common question is whether subsonic 300 Blackout will cycle without a suppressor. Many semi-automatic AR builds need a suppressor or an adjustable gas block for reliable cycling with subsonic loads, so test yours. Another common question is whether 220 grain bullets stabilize in a 1:8 twist. Yes. The 1:8 twist common to 300 BLK barrels was chosen to handle heavy subsonic bullets.

Remington 28430 is new production ammunition, not reloads, made in the USA. It uses reloadable boxer-primed brass cases and non-corrosive primers. This listing contains 10 boxes of 20 rounds for 200 total from one lot. Consistent velocity from a single lot keeps every shot safely subsonic and every impact at the same height on target.