Back in the 1980's a large manufacturer of half-stock percussion rifles learned about the term "stack-up tolerances" in a difficult manner. Their barrels were usually bored from solid, of various materials, finally settling on 1137MOD. The bores were not perfectly centered, of course none are, and there was a certain tolerance covering out-of-center. They tended to cut sight and tenon dovetails rather deep in my opinion, but I don't know the dimensions. There were of course tolerances + and - how deep or shallow the dovetail cut could be. On a few bad occasions the dovetail was at the deep end of tolerance, right over where the out-of-center bore made the barrel wall the thinnest. This cost more than one skilled tradesman his left hand.
