IMHO, over-boring and back-boring result in better patterns no doubt. In modern times, the size is much greater. Browning back-bores some of it guns to .742. Mossberg over -bores the entire barrel to 10 ga size. I think they size them at .759. That is a lot more then .734-which wouldn't seem to me to makes that much of a difference although Beretta today claims their barrels at .730 are overbored (there std size is .725).
I just wonder if the .734 would have to be special order and if it was thought to make a difference. With regards to damascus, I guess some folks just liked them.
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