Mr. Anderson is being very trusting of "factory bore diameters", which may vary by about .030 from gun to gun. I personally don't care if gun buyers measure bore diameters and wall thickness, but I will continue to do it after 56 years of paying cash for double barrel shotguns. My equipment cost me about $300, has been working for decades, and has protected me through hundreds of thousands of dollars of potential mistakes. A selling dealer who tells you he doesn't own a bore gauge is a liar. He just won't let you see him using it.
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