Hi Dig, Thanks for the input. I would assume that there would only be one level of magnum proof for a 3 1/2" 10 as there is modern ammunition available which is likely loaded to maximum pressures. The question becomes whether there is an option of standard or magnum proof for a 3 1/4" chambered gun. The plot thickens....


Better to keep your mouth shut and be thought stupid,than open it and confirm.