Why?
It's so easy to load one, why take the cylinder out of the gun?
I use my 1851s in cowboy action matches several times a year. I am right-handed, and hold the gun muzzle up, butt on the table (or your thigh if you are out in the field) in my left hand. Put the gun on half-cock to allow the cylinder to rotate, then drop the rammer into one of the chambers to stabilize it. Throw a powder charge from a flask into the chamber next to the rammer, seat the ball, and repeat 4 times. (leave one empty for safety). Then put a smear of lube over each ball. Cap the five loaded chambers when you are ready to shoot. I can reload an 1851 in a minute, literally, without having to take the gun apart. Capping 5 nipples with a Tedd Cash snail capper may take another 20 seconds.
Sam Colt would have provided a loading stand or press if he thought you needed one!