Just make sure you clean the gun because primers are slightly corrosive, all of them. Check after the first one to see if they are punching through, because that would indicate that the firing pin is slamming against the bolt face, which would work harden it as if you were dry firing. To some extent the backblast of the boom does cushion the pin, and on an M1A or something, where the hammer is really really heavy, it might need it.