i've got a mississippi arms autoplug and any thing i throw in it it'll fire. i shoot the value stuff from walmart in the drum and big mag. for HD first round is round is pdx1 buck n ball the rest is 00 buck
ive got the auto in mine runs great and as far as the overgassing i dont think it is cause i loaded a mag with various loads from federal, winchester, and remington. couldnt even tell what was what they all felt the same