Hi,
If Merkel, Blaser, Chapuis don't turn your crank you can go to Krieghof, Heym, Verney Carron, Browning. If these ones don't do it i wish you good luck and heavy wallet because you will need to go to English or Austrian gunmakers....
As Karl wrote in Europe some DR are scoped for driven hunt mostly because of eyesight's problem with aging hunters.
Be careful with scope mounting on DR. Better ask for when ordering, with zeroing and regulation being done by manufacturer. Some doubles can loose regulation when scoped because of weight transfert and vibrations. The modern over under doubles from Merkel, Krieghof, Blaser and Heym are the easiest scoped ones. They are made for by design.
Calibers are generaly restricted to maximum 9,3x74R.
The bigger caliber models are mostly made for close quarter and work with open sights.
Always have in mind that regulation is mostly done at 50m excepted by Browning (60m) and Merkel (75 for scoped model). Some DR are equiped with an adjustable system but zeroing double to hundred meters is a long and expensive job if you want it first class.
Good luck
Dom
