Where are you guys coming up with these claibres? I look up the Chapuis Double Rifles and they list some of the usual suspects: 300 Win Mag, .375 H & H, .470 NE, .416 Rigby.
I've been looking for a good double rifle for awhile, resigning myself to Blackpowder muzzleloaders (which can be VERY cool & fun) but have not been able to get an affordable CARTRIDGE Double in an easily obtainable ammo.
I've had my heart set on the unobtainazble, I'm afraid, and the modern Chapuis waresdo look interesting (the little I've actually seen of them). 7 X 7.57? Sounds REALLY good to me, but I don't see it listed anywhere with the Chapuis doubles.
Best Regards - Marc