I do not speak to all barrels of various makes of shot guns, however, I do not own a wall thickness gauge and do not feel that I need to. I own a bore gauge from Brownell's and use that. I believe that if a barrel is at or near nominal ID for the gauge, then the barrel remains close enough to original specifications to use cartridges producing pressures for which the gun was intended. I believe I know general original wall thickness of Parkers for example sufficiently enough to conclude that an overbore of several thousands will not reduce wall thickness to dangerous thinness. It is only when the bore gauge shows a large deviation from nominal that I would be concerned.
I am not a dealer, table top or otherwise, not a seller and rarely a buyer. If I were a dealer of shot guns, I think I would find that many buyers would want to know wall thickness and some would not be comfortable in knowing only bore ID. I think it is great that some such as Jay Schachter state wall thickness.
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