Barnes Suppressor Series .300 AAC Blackout — 205gr Subsonic

Barnes Subsonic .300 Blk 205gr Sierra Game King Ammunition - 20 Rounds

Get purpose-built subsonic performance with a bullet that actually expands. Barnes Suppressor Series 205gr Sierra GameKing is .300 Blackout ammunition engineered for suppressor use, loaded with a bullet designed to deliver dependable terminal performance even at subsonic velocity.

This load pairs a 205-grain Sierra GameKing hollow point with a muzzle velocity of 1,060 fps and 512 ft-lbs of muzzle energy, keeping it below the speed of sound for noticeably quieter shots when running suppressed. The GameKing is designed to expand even at subsonic speeds, which makes this load a practical choice for target work and for medium game at appropriate ranges, not just punching paper. Clean-burning propellants reduce gas blowback and improve cycling in semi-auto platforms, so your suppressor and action stay cleaner during longer sessions.

Each round is loaded into polished, reloadable brass cases with non-corrosive boxer primers, built for reliability and accuracy in virtually any environment. The line is produced in the United States, and each box holds 20 rounds.

Whether you're running a suppressed .300 Blackout, want a subsonic load with real expansion for hunting or target work, or need ammunition engineered around suppressor use, Barnes Suppressor Series 205gr GameKing delivers purpose-built quiet performance.

All ammunition sales are subject to applicable federal, state, and local laws.

Frequently Asked Questions

Q: What caliber and bullet weight is this ammunition?
A: It's .300 AAC Blackout with a 205-grain Sierra GameKing hollow point bullet.

Q: Is this ammunition subsonic?
A: Yes, it runs at 1,060 fps, below the speed of sound, and is specifically designed for suppressed shooting.

Q: Will this ammunition cycle a semi-auto .300 Blackout?
A: Barnes loads this ammunition with clean-burning propellants designed to reduce gas blowback and improve cycling in semi-auto platforms. As with any subsonic .300 Blackout load, reliable cycling depends on your firearm's gas system and whether you're shooting suppressed, so test it in your setup.

Q: How many rounds are in each box?
A: Each box contains 20 rounds.

Q: How is this different from the 220gr MatchKing Suppressor Series load?
A: This load uses a lighter 205-grain Sierra GameKing bullet, designed to expand at subsonic velocity for target and medium game use, while the 220-grain load uses a Sierra MatchKing bullet, known for accuracy and well suited to match-style and precision shooting.

Q: What type of cases and primers does this ammunition use?
A: It's loaded into polished, reloadable brass cases with non-corrosive boxer primers.