When fully loaded to 50 rounds and racking the bolt back I can feel it scratching the cartridge. After ejecting that first round I can also see a visible scratch on the cartridge as well as "lacquer" flakes on the bolt. I have also noticed that when fully loaded to 50 rounds if I try to gently lock the magazine in place there is palpable resistance. I can however normally slap it in no problem. I seem to be getting more resistance with the American Eagle FMJ's over the V-Max.