I just shot my 1929 Fox Sterlingworth, a 12 gauge. The original legomutton case is marked 2&3/4 inch and a 1&1/8th oz load. I shot it with standard 1 oz skeet loads and she gave me a good wallop!
I have not measured the chambers, have no way to do it, but now I'm wondering. I shoot a lot of 12 gauge double shotguns and I've never had one give me such a hit.
Just read an old Jack O'Conner book about shotguns and he wrote that short chambers don't make a diff. Maybe with paper shells, but seems to me that modern plastic cases would kick a little harder and cause a pressure spike.
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