Yes, the Browning family made some. And often the harmonica's, superimposed loads, Colt's revolving rifles, and such were unintentional repeaters.
Due to that problem, not likely we'll see repros of these designs.
And that's why muzzleloading often is perceived as a primitive technology...much of the advances (or tech mistakes) are either very rare, or not being reproduced.
In lines, whatever, can't see any practical advantage over a 1850's-1860's rifled musket. Excepting the Sharp's that was the most advanced the historical stuff was, at least in general use.
Gods, I wonder what a state fish&game would make of a revolving, harmonica, or superposed load muzzle loader?