Every one of them I have seen had the "Non Pour Balle" warning on the flats. It isn't a slug gun, the barrels are light enough you could do damage to them using slugs in them.

Every Frenchman I ever met was crazy about woodcock hunting, and much more crazy about woodcock eating. I never met one who felt that way about rabbits or hares.
I suppose things change, but, the gunmakers I talked with about their hunting had Spaniels and English Cockers. Nobody mentioned ferrets. The Bruchet's apprentice, Jerome, had a cocker.
Hervé Bruchet was not a hunter or shooter. I don't believe Richard Levi was, either. Both guys told me that on Friday, when they walked out of their respective shops, they were all done thinking about guns, shooting or hunting until they came back on Monday morning.
Hand building fine guns was their job. Both men were passionate about other things.

Best,
Ted