2 inches at that distance is quite good for a double in this price range, and you are lucky to get a good one. I know someone that got good accuracy but poor regulation (about a foot separation at 50yards) with his Baikal 45/70 and used the adjuster and shims to fix the regulation but lost accuracy out of one barrel (went to 4 inches at 50 yards).
Still, okay for hunting - could aim off if required. I forget the brand, but there was/is a company that makes a double barrel 45/70 with two rear sights as standard to handle the regulation issue ie one rear sight per barrel.
David Pedersoli I believe made something similar that was offered through Cabela's as well as a 72 cal BP double.
