I am very clear on saami and what you and 243 provided, and again I really appreciate everyone's input. I know that manufacturers deviate sometimes, such as glock cuts a recess in the unsupported part of their 40. chamber. so I was just curious since I'm only .001-.002 from sammi if that is what others are getting on their similar products. in the grand scheme of things my barrel may be within tolerance. I still don't "think" I would have bulged my chamber and only moved it .001, when in all reality being a refurb it could have .001 worn out of the chamber... I'm not being cheap or "taking any risks" I am just trying to get a confirmation as to whether this is normal or not. and since sig apparently is afraid I'll sell their secrets to the Chinese I'm having trouble making that determination. I'm not leaving out any of the advice given in this thread, I'm just starting with the gun to ensure it is safe, and working backwards.