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BACK IN STOCK! 300 AAC Blackout Subsonic 220 Grain Sierra MatchKing NEW BRASS!!! -Ships free.

Headwaters Ammunition

  • $699.99
  • Save $200


Please note, that this is a high demand product and we will get your order out to you as fast as we can. We are filling orders as they come in, but it is taking longer than normal.  We appreciate your understanding as we value you as a customer and want to make sure each order is processed accurately.  Thank you for your understanding. Our components have drastically increased in price and availability, so unfortunately we have had to raise our pricing.  Shipping is always included for free.

F.O.G. has packaged these in two options, 200 rounds and 500 rounds.  Please make sure you select a quantity.  The  500 rounds are the best deal per round. 

300 AAC Blackout Subsonic features great accuracy and knockdown power from the 220 gr 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. Please see notes in red below.

All sales are final, no returrns or exchanges on ammunition.


Caliber: 300 AAC Blackout
Bullet Weight: 220 Grains
Bullet Style: Hollow Point Boat Tail Match
Case Type: New Brass
Velocity: 1050 fps (Subsonic)
Quantity: 200-500

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