Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives (C.I.P)
http://www.cip-bobp.org/
Standard CIP proof pressure of 850 kg per sq. cm. (BAR) = 13,920 psi for a service pressure of 10,730 psi
Shotgun recommended minimum wall thickness (p.4) for “Standard Steel” with
tensile strength = 101,526-123,137 psi
http://www.cip-bobp.org/sites/defaul...e/A-4-1_EN.pdf
10 & 12g........................
20g
End of chamber - .079”.....075”
4” from breech - .075”.....071”
8” - .043”........................041”
12” - .030”......................028”
The Hunter's Encyclopedia, Raymond R. Camp Editor
From the German proof house: minimal wall thickness at the end of chamber, regardless of length, for 12, 16 & 20 gauge guns should be 2.3mm
(.0906”) for “Ordinary Good Steel”
The tensile strength of your crolle damascus barrel is about 55,000 psi - 1/2 of CIPs "standard steel". I would use your gun only with full length subgauge tubes which to my knowledge no one makes in 16g. I am sorry.