Tradeex Canada located in Hawkesbury Ontario sells Chapuis and Verney Carron double rifles. Check out their website and click on Double Rifles. They have an over under VC in .303 British that gets my heart pumping. Rifle porn indeed.

As far as doubles for hunting, the .500 Nitro would be my first choice. Recoil is not much different than the .470, but it hits harder.