Double O/ rifles are very much "a la mode" in Europe the last 20 years for driven game hunting.Most O/U shotgun makers got into the game by adapting shotgun receivers to 8mm-9,3mm barrels and most of these products give decent quality for the money (about 2500-3000 euro). And then there are the top makers who have been building O/U rifles since generations: Browning(CCS25) and other makers in Belgium, Krieghof (Teck and Ulm), Beretta (top models),Merkel, the Ferlach makers...
These rifles offer better quality for (a lot )more money. You say you are looking for a 375 Magnum, and for a good, reliable rifle in this caliber you have no choise but to look at the top makers. It is no coincidence that the new makers offer nothing bigger than 9,3. Big bore O/U's (and SxS for that matter)demand great knowledge and experience. Big bore O/U's have been made by most top makers and they are (in my opinion) every bit as good as big bores of the SxS configuration.I do prefer SxS's for their looks, but O/U's are by nature very strong and handle verey nicely. Some say they are (because of a bigger angle to open) to slow for dangerous game, but I think otherwise. I can detect no real difference between my Krieghof 458 and my Westley Richerds 450NE. If this were so, we would have to rule out the following rifles for use against dangerous game: rifles with no ejectors; those with outside hammers, those with Jones underlever...
Greetings,
Livinus