Probably the most critical point of wall thickness is where the chamber ends and the forcing cone begins. For instance if a gun was ordered to be 'light as can' or 'light as possible' it would have been built on the smallest frame for the gauge (16 on the 0-frame, 12 on the 1-frame, 10 on the 2-frame) and the barrel filer would have brought the barrels to the minimum. Now, if someone today considers lengthening the chambers.... he better think again.
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