Everyone may have their own opinion on the matter. And a lot of it may be a “well, I have shot guns as thin as… with no issues, so that is my acceptable minimum.
As I recall british proof houses determine .018” to be the acceptable minimum at any point. And I personally do not like to see less than .020” as an absolute minimum. It also depends on where that is in the barrel set. And also measurements at other important parts need to be looked at with more priority. Ie: at front of forcing cones and at 9-10” from the breech (around the forend loop on Parkers).
What I would call normal in these areas for Parkers is .085” or more (usually more like around .100”) and .045”-.070” respectively. Based on barrel sets that I have measured.
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B. Dudley
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