Thanks Larry. Accurate information is always appreciated. Just now for curiousity I measured the chamber walls on a 16 gauge 2 1/2" Brit gun. They look to me about average in that chamber walls are 5/32" at the breech then taper down to .096" right at the start of the cone. If I were to deepen them .250" the minimun chamber wall thickness would be pushing .085" I think this is a typical English 16-bore game gun, not extra light, weighs a little under 6 lbs. .085" would probably be OK in 16 gauge, smaller diameter tube= stronger, etc. But what if it was a 12 gauge? What then? You mention a tenth of an inch as being what you would be comfortable with. I guess my point was, I see lots of Brit game guns that have been deepened and reproofed, but why? It doesn't add anything to 'em. If the cones were just lengthened people could go ahead and fire the 2 3/4" cartridges in a stronger tube with little or no extra increase of pressure. That's my objection to lenghtening chambers right there in an nutshell. What's the point? Pay a bunch of money to have "Reamer Rube" do his thing, then another bunch to the proofhouse but end up with less gun.
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