[Chesster]

Dave, I see no way to quantify the wear and tear per round. Years ago, I read where a gun writer stretched the frame on an airweight Smith J frame to where the firing pin would not reach the primers after a couple hundred rounds of the hot +P+ .38 ammo. I've also read of the British military cracking frames on Browning Hi Powers with a steady diet of 9mm Nato which is hotter than American commercial loads. I typically run a couple hundred rounds of the hotter stuff through a pistol if I plan to carry it for SD to assure it is reliable and then just a mag or two yearly while practicing with the cheapest reliable ball I can find.