300 AAC Blackout – 198 gr Dual Performance – Black Hills (D300WHISPERN6) – 500 Rounds

Subsonic 300 Blackout is at its best behind a suppressor, but many subsonic bullets struggle to perform on impact at such low speed. This listing is Black Hills 300 AAC Blackout 198 grain Dual Performance subsonic ammo, MPN D300WHISPERN6, sold as 500 rounds for suppressed hunters, home defense rifles, and agencies that run quiet 300 BLK carbines.

Black Hills lists this load at 1,050 fps with 485 ft-lbs of muzzle energy, below the speed of sound so a suppressor can keep the report quiet. The Dual Performance projectile is precision machined from solid copper and is designed to deliver dependable terminal effect at subsonic velocity, where conventional expanding bullets often fail to open. Being lead free, it can be used where lead projectiles are restricted for hunting. It is intended for hunting deer and hogs at short range and for defensive use with a suppressed carbine.

This ammunition fits firearms chambered in 300 AAC Blackout, including AR-15 rifles and pistols with 300 BLK barrels, the SIG MCX and Rattler, Q Honey Badger, B&T APC300, CZ 527, and Ruger American Ranch. A common question is whether subsonic 300 BLK will cycle a semi-auto without a suppressor. Many AR pistols and rifles need a suppressor or an adjustable gas block to cycle subsonic loads reliably, so test before relying on it. Another common question is how far subsonic 300 BLK is effective. Its trajectory drops quickly, so most hunters keep shots within about 100 yards and confirm their zero with this exact load.

Black Hills D300WHISPERN6 is new production ammunition, not reloads, made in Rapid City, South Dakota. It uses reloadable boxer-primed brass cases with non-corrosive primers. This listing ships as 25 boxes of 20 rounds for 500 total from one lot, which keeps velocity safely and consistently subsonic across the whole supply.