I'm pretty sure you'd find short chambered Model 97 12's, because the standard 12ga length was 2 5/8" when they first came out. Model 12's . . . there are certainly short-chambered 20's and 16's; maybe there aren't any short-chambered 12's, but they appeared during the period when the transition was being made from 2 5/8 to 2 3/4. And I didn't mean that the chamber length would be marked on ALL Model 12's, just on those that are factory 3" (which would all be later guns). The Heavy Duck, for example--all of which were 3" guns--didn't come out until 1935.
