I think that if you measure all 28" guns,they are 3" chambered.As to why the guns are stamped 23/4" I can only guess that the Japanese thought you would only shoot clays with 23/4"shells and marked the barrels accordingly.From a manufacturing standpoint,it makes sense to standardize the barrels.Every 26" gun I have seen had 23/4"and every 28"had 3" no matter how it was marked.There is also the possibility that the clays guns were marked 23/4" by mistake.Anyone who has worked in a production line knows errors can happen.
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