• .300 AAC Blackout 220gr Sierra HPBT *Sub Sonic* 250rnd box
  • .300 AAC Blackout 220gr Sierra HPBT *Sub Sonic* 250rnd box
  • .300 AAC Blackout 220gr Sierra HPBT *Sub Sonic* 250rnd box
  • .300 AAC Blackout 220gr Sierra HPBT *Sub Sonic* 250rnd box
.300 AAC Blackout 220gr Sierra HPBT *Sub Sonic* 250rnd box

$231.25






This ammo is loaded in MAST new cases with a Sierra 220gr. HPBT Match King. The average velocity of the ammo is 950 FPS FPS and was tested with a 16" barrel w/ a carbine length gas system. Velocity will differ with different barrel lengths and individual shooting conditions. This ammunition contains Mil-Spec primers and the use of traditional bolt guns could result in misfires due to thicker walled primer. This ammunition has shown to have reliable function in carbine gas as well as pistol gas.

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 and drastically reduce the report from the firearm.

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