There is a gun in Holt's auction with .012 wall thickness in one barrel. It passed proof and is being sold as "in proof". British proof is a crock. Of course, that is not what we're discussing here. We're discussing the poor quality of UK gunsmiths who grind out barrels, inside and out, to the point that auctioneers have to describe a fine gun "wall thickness below recommended minimums".
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