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My grade 0 underlifter S/N 8036 has chambers (3") that measure .810 as best I can measure with small digital calipers. The bore diameters are .744 and .746. I'm sure the chambers, forcing cones, and chokes have been messed with. The bore diameters are consistant from about 6" from breach to the start of the choke.
What do I have?
Also, my 12ga TL S/N 27356 have chamber diameters of .810 and bores of .758. These are consistant with Austin's plot.