So if you start with typical Parker wall thickness of say .032 for all gauges ( heavy waterfowl guns were thicker) and honing once often takes .008, then you have .024, and then a second hone to clean the bores because used gun buyers like shiny bores because it shows the gun was not used much, another .008, and you are at......
I'm aware of a 20ga Parker ruptured barrel in the forward 1/3rd, wall thickness .006, but those bores sure were shiny. No obstruction.
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