Just to clarify notes on wall thickness (all ref 12 bore)which were not apparent the way that article appeared in print. It was originally a two part art. that was chopped back to one part without subsequent review,in grafting some of the part sentences together meanings were blurred. On a game gun built to standard weight I would like to see a minimum of .025", between.020"&.025" are considered safe and probably will be satisfactory but generally get a comment of actual dimension if the gun is sold at auction. Below .020" it is usual to state Wall thickness below recommended minimum. NOTE these all refer to the Thinnest area found which should be 5-9" back from the muzzles. The 9" or proof point wall thickness that correspond to the above would be .040-.050" Generally Pigeon guns will have more mass and be at the higher end of the range,guns designed as light weight will be at the lower end of the range. Purpose built 2" guns are an exception to the above and often left proof with .018" as their thinnest section. The original posters .016" @ 12" from breech is to my opinion too thin to sell.
