Eightbore.
Life and time is far to valuable to spend splitting hairs with you, also you seem to be of the opinion you are talking to someone who actually cares I gave the design away for any person to make and use. I think I will let Rhett Butler of “Gone with the wind” give you my final word on this subject “Frankly _ _ _ _ _ _ _.” And let people who have at least gone to the trouble to make one give their objective opinions.
Damascus Well said indeed, Sir! I prefer the Jon Hosford gauges- are you familiar with them perchance. Life is waaay too short for hair splitting over such pettifogging details- if the shotgun in question shoots to POA, fits you, and you kill birds well enough with it, the rest is, to borrow a word from Lewis Carroll- "Brillig"! From my personal point of view, we have on the DoubleGunWorkShoppe run by our genial host Dave Weber- a miss-mash of members from specific side-by-side double gun collecting associations-
Some, but surely not all, of those "gentleman" will argue with you until Henry the 8th is re-incarnated and forgives Anne Boylen for sleeping around whilst they were married- argue about how much mustard Gottleib Anschutz's Frau put on his liverwurst and onion sandwiches in 1921 (He was a frame filing shop foreman at Parker Brothers in CT. then, by the by!!