When I was much younger, it was a mystery to me why Civil War troops were not issued the revolving rifles. It just made sense looking at them that soldier would be better armed this way, than the single shot muskets they were issued. Looking at the pictures of them, it looked like a great and simple idea. Just make the revolver into rifles and you could solve a bunch of problems, or so I thought as a kid.
I thought this until I started actually shooting B.P. revolvers. Now, I totally understand why NOT. Just the wrist burns alone would be enough not to have a Colt revolving Rifle, much less the possibility of a chain fire.
And if you tried to solve those problems by closing off the end of the cylinder, then you'd have loaded hand grenade looking for a place to happen.
As usual, when you don't know-well you don't know.