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Old October 13, 2017, 05:48 AM   #14
Mobuck
Senior Member
 
Join Date: February 2, 2010
Posts: 6,266
In my experience the only cartridge that doesn't "foul the ammo in the magazine" is the 300BO. Even my AA piston uppers do this but to a lesser extent. I expected the piston system to take care of this but evidently the back pressure in the barrel is sufficient to blow carbon back past the case as the bolt is opening. A heavier buffer might decrease this but it's only what I'd call cosmetic so I haven't tested this idea.
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