doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Barrel wall thickness, what do the numbers mean?

Rule 18 of the "Rules, Regulations and Scales" published by the Guardians of the Birmingham Proof House stipulates the bore be measure 23 cm(9.055")from the breech face. Wall thickness must be considered the whole distance of the tube by especially in the area it could be dangerous as Drew has pointed out. The proof house does not have a minimum wall thickness required. Tube set must simply pass proof.

http://www.gunproof.com/Proof_Memoranda/RULESOFP.PDF