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Headwaters Ammunition 300 AAC Blackout Subsonic Sierra 220 Grain MatchKing Hollow Point Boat Tail Box of 20 Rounds

300 AAC Blackout Subsonic Sierra 220 Grain MatchKing Hollow Point Boat Tail Box of 20 Rounds

Headwaters Ammunition

  • $23.99

This product is optimized for all barrel lengths, utilizing a pistol length gas system.

300 AAC Blackout Subsonic features great accuracy and knockdown power from the 220gr Sierra MatchKing Bullet and is much quieter than your standard subsonic ammo, this round is perfect for AR-15s or bolt actions chambered in 300 AAC Blackout. Remanufactured ammunition is produced by carefully assembling selected components that include bullets, propellants, primers and once fired brass cartridge cases. The bullets, propellant and primers are always newly manufactured while the brass cartridge casings are typically reprocessed.


Caliber: 300 AAC Blackout
Bullet Weight: 220 Grains
Bullet Style: Hollow Point Boat Tail MatchKing
Velocity: 1015 fps (Subsonic)

Please note: The reduced pressures associated with subsonic ammunition can affect the proper cycling of gas operated firearms. Subsonic ammunition is best used with a suppressor. Suppressors create more back pressure and help achieve full cycling of the gas operated system. We cannot guarantee proper cycling if not using a suppressor and a pistol gas system. Due to Noveske's extremely tight tolerance match grade chambers, we will be unable to guarantee functionality of this product in those firearms. If you have questions in regard to this policy, please contact us at
WARNING: You must be 18 years or older to purchase rifle or shotgun ammunition and 21 years or older to purchase handgun ammunition. All ammunition will be shipped UPS ground or Spee Dee Delivery. For safety reasons, we do not accept returns on ammunition. Always make sure you use the correct ammunition for your specific firearm. Check your local laws for any other regulations.
  • ATTENTION: Residents of CA, CT, Del., District of Columbia, Ill, Mass, N.Y. and Ohio please check your local laws prior to ordering ammunition or ammunition components.

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