Years ago I measured an untouched 30" CHE 12 bore that had been in the seller's family since its original purchase in the later 19-teens. Both bores measured .750 on the button with chokes of .712 at the muzzles. Length of the forcing cones was around 4 1/2- 4 3/4 inches. I didn't have any chamber measuring tools at that time so can't say if it was a 3 inch gun or not. It was a #3 frame and plenty heavy, complete with two perfectly drilled out, then filled and checkered over, plugs in the SKBP checkering field. When I shook it I couldn't feel or hear anything rattling around, but I'd bet to this day there was weight added in the stock.
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Threaded Mode