Cart 0

It's back. 300 AAC Blackout Subsonic 220 Grain Sierra MatchKing NEW BRASS!!! -Ships free.

Headwaters Ammunition

  • $629.99
  • Save $70

FOG is back making our premier round.  We have packaged them in 250 and 500 round boxes.  The 500 rounds are the best deal, as always they ship for free.  This will be a small run and we do not know when we will be making these again. 

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 returns 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: 250-500

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.

  • We Also Recommend

    Customer Reviews

    Based on 11 reviews Write a review