The Barnes Suppressor Series Sierra MatchKing .300 AAC Blackout 220gr HP Subsonic Rifle Ammunition (brand part no. 32518) is a purpose-built subsonic load engineered specifically for suppressor use. Barnes pairs premium Sierra MatchKing hollow point projectiles with clean-burning propellants to reduce gas blowback, improve cycling in semi-auto AR-platform rifles, and deliver noticeably quieter shots through suppressor-ready firearms. It’s an excellent choice for hunters and shooters running suppressed .300 Blackout builds who want dependable subsonic performance without sacrificing accuracy.

Key Specifications

• The 220-grain Sierra MatchKing hollow point projectile is loaded to Barnes’ exacting accuracy standards.
• A subsonic muzzle velocity of 1,060 fps keeps the bullet below the sound barrier for reduced report through a suppressor.
• Chambered in .300 AAC Blackout, purpose-built for suppressed AR-platform rifles.
• Uses brass casings for dependable ignition and reliable extraction.
• Each box contains 20 rounds, a standard count for range and hunting use.
• Priced around $1.34 per round, reflecting the premium subsonic-optimized components.

Frequently Asked Questions

Is this ammunition designed for suppressor use? Yes, it’s a purpose-built subsonic load optimized for suppressed .300 Blackout rifles.

What bullet does it use? A 220-grain Sierra MatchKing hollow point.

What velocity does this load produce? Approximately 1,060 fps, keeping it subsonic.

Buy the Barnes Suppressor Series .300 AAC Blackout 220gr HP Ammunition

Outfit your suppressed build with proven Barnes subsonic ammunition. Browse our rifle ammunition selection and get fast, insured shipping from our Lubbock, Texas gun shop.