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Headwaters Ammunition 300 AAC Blackout Subsonic Sierra 220 Grain MatchKing Hollow Point Boat Tail Box of 50 Rounds

300 AAC Blackout Subsonic Sierra 220 Grain MatchKing Hollow Point Boat Tail Box of 50 Rounds

Headwaters Ammunition

  • $49.99

On sale for $.84/round, this is what we sell our 500 Round Bulk box for.  On sale now thru Monday, September 18 at midnight or until they are sold out.
This is a great option when you just can't spend the money for 500 rounds.  These are packaged in a 50 Round Box and you will get free shipping if you spend over $125!

This product is for use with a pistol length gas system and suppressor.

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.


Caliber: 300 AAC Blackout
Bullet Weight: 220 Grains
Bullet Style: Hollow Point Boat Tail Match
Brass: Reconditioned
Case Type:New Brass
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. 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
We cannot guarantee proper cycling if not using a suppressor and a pistol gas system.

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. 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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