Several times on this forum an illustration (circa 1900) has been posted that showed the minimum barrel specs recommended at various distances based on a nominal bore of .729 (12 bore)

Does anyone have the reconmendations for 10, 16, 20 and 28 gauge? Either in illustration or written form? I'd like to get more from my wall thickness and bore gauge measurements for the subgauges and this info would be handy. (e.g. Min recommended thickness at 6-9-12" from breech)

Much appreciated!