Most period 12 bore English doubles were had chambers of 2-1/2 inches. They could, most probably, have been ordered with longer chambers. English wildfowl guns typicall have chambers of 2-7/8 or 3 inches. My guess that many English guns being produced in recent years will have 2-3/4 inch chambers. Beware of early English guns that have 2-3/4 inch chambers that have been bored out. They would be out of proof and cannot be legally sold there or shipped over here.

Best regards, George

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