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Old October 13, 2017, 02:50 PM   #15
Bartholomew Roberts
Senior Member
Join Date: June 12, 2000
Location: Texas and Oklahoma area
Posts: 7,661
In my experience the only cartridge that doesn't "foul the ammo in the magazine" is the 300BO.
The top of all my .300 BLK PMAGs are all black, though the subsonic mags aren't as bad as the supersonics - I'd guess less gas volume is the reason.
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