In the swamps, marshes and thickets of the south east, the smoothbore's versatility, plus the variety of edible game, from dove to(in years long past) elk, the smoothbore won hands down. A dubbl burril gave folks even more options, with having a large game and small game both loaded at all times. The waterfowl here alone required a smoothbore. The smoothbore must've worked well on elk, because there weren't any left here when cartridge rifles came about. Today, if you NEED a rifle to hunt here, you are in a clear cut, burned area, body of water, farm field, or some other man made area. The woods are just too thick to justify 'needing' a rifle.
(That said, I own more rifles than any other type of gun).