Phil,

I don't have any experience with Sercey, but I own a Chapuis in 9.3x74r. I've never heard of problems with them going off face in 470nitro (wouldn't surprise me with the rimless 375 and 416s though, and that's not Chapuis' fault its just shooting a high pressure cartridge out of a double). Though I think some of their interior finishing inside the action can be rough, mine needed a "cleaning" but other than that I've no complaints. If you are looking to France, the Chapuis in 470 would run you only about $5,000 new, and since you are not French (right?) you can avoid the 33%TVA. For the French guns I would recomend Demas. They make doubles in almost any caliber you ask (can get 500 nitro even!!), and their AZUR model SxS had a better reputation in France than Chapuis. They use three locks, rather than the two that Chapuis uses in their Blitz actions. Price is about the same as Chapuis, maybe a bit less. Just some food for thought.