These might be an interesting addition to add some color to an encounter. The French Guycot guns seem to be the more reliable versions of employing chain magazines:
http://firearmshistory.blogspot.com/...in-guns-i.html
But if you want to have something that is totally ridiculous in the hands of some rich aristocrat, you might consider this beauty:
https://museum-of-artifacts.blogspot...r-48-shot.html