How about a 2.5" proof load at 13,000 psi fired 2x in each barrel, fired from a safe distance via a string?

That would be how CIP would establish safety.

For a learned batch of enthusiasts you guys sure dont go long on facts to assist this gent in determining the safety of his gun.

Yes it's Belgian crap but its also a family heirloom. I'm sure if it was established to be safe this fellow would enjoy shooting it occasionally.