Barrel wall thicknesses along the entire lengths is critical. Before you do ANYTHING in the way of making it ‘shootable’ you must have the barrel walls measured by someone with the proper tools to do it correctly.
Judging by your most recent pictures my impression of those chambers and breech faces of the barrels as poor or at least very suspect.
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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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