I have shot a friend's 50-140 Rolling Block in the past, so it can be and has been done. I honestly can't recall the modifications he needed to do to be able to load that cigar into the bore, though. Lee Shaver, or any other BPCR familiar gunsmith would be able to tell you.

Someday I hope to be the person my dogs think I am . . .
The only true cost of having a dog is its death.
Someone once said "a nation of sheep will beget a government of wolves."
Shiloh Sharps . . . there is no substitute.
NRA Endowment Member