doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Pressure question

The gun will be in proof until the bores are .010 over proof. With metric measurements I think it is .008 now. Any way, yes your gun is in proof. We put too much stock into believing proof means it is perfectly safe. I put a lot more stock into wall thickness. I know of two0 guns which recently passed re-proof with barrels as thin as .015 and .016". Now consider they will still be in proof with .009" removed from the bore. That brings them down to .006 which is the thickness of a Coke can. In proof is not everything. .020, in 12 bore gets my slow down attention. That is why I bought wall thickness measuring tools and learned how to use them. If you go to a major SxS shoot see if anyone there can measure the wall thickness for you.

See the 3rd post. The gun was proved in 85' and again in 86' when the Proof House was still using crushers. It was proved then under the 54' - 89' Rules at 900 Kg/cm2 for a service pressure of about 9500 psi by transducers.
Starting in 1989 it would have been proved per CIP at 850 BAR for a max. service of about 10,700 psi by transducers.

It was in 1986. That may seem like a non-answer, but we don't know if someone messed with the gun in the intervening 40 years.

The gun looks like it's in good condition, which tends to make me think it's been well maintained...but no one can say with 100% confidence that someone didn't mess with it and it was cleaned up and refurbished after that without re-proofing.

If I wanted to be certain, I'd have someone I trusted with a wall thickness gauge go over the gun carefully if I were worried about potential this spots.

I'm running my wall thickness gauge over all the guns I'm buying, and getting better at it, but if I saw a spot that concerned me, I'd have it checked.