I agree with Chuck's metalurgy. Looks to me like you will be removing .034" diameter on the inside and 0.034" diameter metal on the outside; meaning you will remove 0.068" of wall thickness. And, it looks to me like you have 0.094" (0.915" - 0.727" = 0.094") total thickness which means you have 0.047" walls (0.094" / 2). Obviously, removing 0.068" from 0.047" doesn't work. Guys, I will be first to say, "Check my math - I have been known to make nisteaks."

I doubt a metal defect for cause of a ring bulge. I'd bet on an obstruction. I'd also bet on the bulge not growing or failing. BUT, I'D INSIST ON A CHECK UP BY A BARREL MAN!!!!

Last edited by Rocketman; 01/29/13 12:32 AM.