The real answer to your question is the reloading of the lower barrel on a O/U has been the problem all along..It is hard to break open and get enough clearance in a stressed situation..It also has to take a wider arch to open and a concerted effort to open "all the way"....thus the over under has never gained popularity in the DGR field, and rightfully so...

It is however a suitable plainsgame rifle and surly is a nice shotgun alternative...