I find this very strange. Surely the gunsmith measured the barrels before he stuck a reamer down 'em. This would have shown any sudden increase of internal diameter consistent with bulging. I have to say that I would be very doubtful of this man's story. My suspicious nature would suggest to me that he had inadvertently run the reamer too far into the bore. Anyway, I guess you should have taken Ted's good advice. You would still have a useable firearm. I don't understand this urge to f#*k around with chambers.