First off, was the gun in question, in proof?
And had the chambers been measured? In England, if the chambers had been opened to 2.75" the gun should have been re-proved and so stamped. I understand the English will not even accept a gun (with lengthened chambers) for re-proof, if the forcing cones have been altered. A look at the barrel flats and measuring the right chamber would give us more info.
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