Barnes Suppressor Series .300 AAC Blackout — 205gr Subsonic

Barnes Subsonic .300 Blk 220gr Sierra MatchKing Ammunition - 20 Rounds

Get match-grade bullet performance in a purpose-built subsonic .300 Blackout load with Barnes Suppressor Series 220gr Sierra MatchKing. This ammunition is engineered specifically for suppressor use, not standard-pressure ammo that happens to run slow.

This load pairs Barnes' Suppressor Series with a 220-grain Sierra MatchKing hollow point bullet running at 1,060 fps, delivering genuinely subsonic velocity for noticeably quieter shots when running suppressed. Clean-burning propellants are selected to minimize gas blowback and improve cycling in semi-auto platforms, so your suppressor and action stay cleaner. The Sierra MatchKing is known for accuracy, making this a strong choice for precision work and match-style shooting at subsonic velocities rather than just plinking.

Each round is loaded into polished, reloadable brass cases with non-corrosive boxer primers, built for reliability under stress and accuracy in virtually any environment. The line is produced in the United States, and each box contains 20 rounds. The heavier 220-grain bullet weight is well suited to .300 Blackout's subsonic velocity range.

Whether you're running a dedicated suppressed .300 Blackout build, want match-grade bullets at subsonic velocity for precision shooting, or need ammunition engineered around clean-burning, suppressor-friendly performance, Barnes Suppressor Series 220gr MatchKing 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 220-grain Sierra MatchKing 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 205gr GameKing Suppressor Series load?
A: This load uses a heavier 220-grain Sierra MatchKing bullet, known for accuracy and well suited to match-style and precision shooting, while the 205-grain load uses a Sierra GameKing bullet designed to expand at subsonic velocity for target and medium game use.

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.