Don't see the price listed , but WOW !!! 
The only double rifles I have ever handled had the regulated load engraved on the rifle.Shop I used to work at had the Siace in 45-70 and Chapius in 9.3x74R. The Siace was the nicer of the two, but I wanted that Chapius as i already load for a Ruger #1 in that chambering. Not too ong ago there was a 16ga double with an extra set of barrels chambered in 444 that was pretty neat. Only one I've ever seen.
Ravenman, has he tried contacting the factory to find out what load the barrels were regulated with?