Thanks for the feedback. Using a 12 gauge bore that was normally let's say .729. If a customer wanted to shoot a larger shot do I understand correctly they might overbore a barrel as well as play with the choke to achieve optimum performance to meet the customers expectations? If so then some overbored barrels might actually be original factory bores?

I don't think .729 was as much of a standard a hundred years ago or more

I expect many guns measuring well into the mid to upper .730's are factory original, but with out it listed in the books- its a guess