With a lot of searching, I can't give a yes/no answer, but I can't find any records of breech loading American made shotguns till the late 1870's Colt in 1878, Remington not till 1881, Parker I belive in 1876 or 1877. Winchester never made a Double till the Wonderful 21 was brought out in the 1930's.
American makers seem to have concentrated on repeaters such as the Roper and Spencer.
Ya got my interest started, I will but it in the back of my mind and keep a sharp eye out for any other imformation.
My opinion for what it is worth, I would say a vast amount of folks in this country held on to the cheaper to use and cheaper to buy muzzle-loader. With shells having to have at least the shot added by the user as I have pointed out before in other forums, my self it would tend to keep me using the muzzel-loader, given the time and circumstance.
For hunting for food, cost was important, remember 1873 started a Depresion almost as bad as the one that started in 1929. If you are using it as a fighting tool and the adversary is close enough to use a shotgun on, would you get more than 2 shots with a double anyway, no matter which end you loaded it from?