That's all I have Bill, but here's what the Brits say
UK Working Standards recomended minimum wall thickness measured 18" from the breech from Double Gun Classics p. 56, Vol. 1, No. 4 Jan-Feb, 2006:
2 1/2" 12g- .028
2 3/4" 12g- .032
Re-proof recomended minimum- .024
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