It's been mentioned in this thread a few times, but I think the most immediate action should be to measure the bores id. It is a much simpler task than measuring the wall thickness and many more people have the equipment. A reproof in 1993 is a relatively recent event in an English shotgun, and a measurement would show if the bores had been modified since then. If they are still at the proof diameter, the only way they would be out of proof is that they had been restruck and reblued since then. I would suspect that the barrels were reblued while the gun was being honed.
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