That subject has been visited several times over the years on this forum. Without revisiting all the details and data on the topic may I suggest using the search function in order to access those very informative discussions.
Incidentally, .030” in the forward half of the tubes is sufficient for safe shooting, of course tapering thicker to the forcing cones.
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"I'm a Setter man.
Not because I think they're better than the other breeds,
but because I'm a romantic - stuck on tradition - and to me, a Setter just "belongs" in the grouse picture."
George King, "That's Ruff", 2010 - a timeless classic.
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