Smith stainless gun's are fairly easy to round butt. I did one this way. I put a set of round butt factory grips on the gun. Traced the outline with a sharpie. Taped the portion not to be touched. Then with a fairly fine stone on a grinder I ground it down to the markings. Then used the polishing wheel to put a finish on it. (Model 65) Far as three inching the barrel? I'd look for or order a whole new barrel. All can be lost in the reaming and crowning. (This advice from my smithie)
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