The Bruchets laughed at me when I suggested re-proof for my R10 that had seen a massive backbore at some point prior to my ownership. I was in town to have it restocked, do some club shooting, look at French girls and drink like fish with Hervé and Richard Levi, of G. Grangers. I ate some cheese, too.
There is a low spot that has about .060 wall thickness, but, most of the barrels were hanging around .090. "Shoot little shells in it, if it makes you feel better", they cackled.
I impressed hell out of them when I drank beer with dinner, instead of Coke, and the native Irish girl at the bar took an interest in me. Helped that my Mom's name was Eileen...
Sorry to pick on an old man, Larry, but, the guns that sell, as opposed to being listed for decades on end, go for right around that. Spanish boxlocks, too.

Best,
Ted