To me one of the worst things that a person can do is bore out the chamber of a in proof double gun. A friend asked me about this horror story of a 2 1/2 in. 20 ga gun. The chambers had been bored to 3 in on one side and 3 1/2 in on the other. I figured for sure the barrels were ruined. Not having a accurate barrel wall thickness gage. I did some calculations. At 3 inches it measured 0.700". I assumed a 0.150 thickness at that point and estimated that the barrel wall had been cut into 0.0425" leaving 0.1175". I believe the minimum allowable wall thickness at that point is 0.090" putting the gun 0.0275" within limits, but of course way out of proof..
I told my friend he needed some professional gun help as I was very uncomfortable with my calculations.
First question; are my assumptions accurate. Second question is there a fix here short of resleeving. I know Briley does chamber sleeving but don't know if that process would work here.
Last edited by pooch; 07/17/12 02:54 PM.
