It sounds like one barrel was finish reamed and polished a bit under nominal bore size. But .005" under or over isn't real unusual or at all alarming in vintage guns. These things weren't built on CNC equipment with cookie-cutter uniformity. I was kind of concerned about a 16 ga. straight grip G Lefever I had bought that had both bores about .007- .008" over nominal 16 ga. bore size. I thought I made a big mistake when I neglected to take my Stan Baker bore gauge when I inspected the gun. The gun was in great original condition, and I had no reason to suspect it had been honed or polished. I later learned that it wasn't uncommon to find an unhoned Lefever that much overbored.
Thankfully, Larry explained to us that .610" is smaller diameter than .615". Who knew... until our ex-intelligence analyst pointed out the obvious? (Deep sigh... eyes rolling....) Too bad he didn't comprehend what the grey man Clapper Zapper said had been obliterated by polishing. I'd explain it to him but I don't think he'd accept it. Besides, some sensitive guys might get offended if I corrected him, and rat me out... again.
