Cap and Ball loads

[Fogman01]

I just bought a 2nd gen Colt 1851 and will be looking to buy a .44 cal either Colt Dragoon or Walker depending on how the auction goes. I have a couple of Shiloh BP cartridge rifles I use 1.5 Fg Swiss in, but I have not loaded a cap and ball. I think the 1.5 Fg is a little large for revolvers. I was wondering what bp is commonly used, both brand and Fg, and what the ball diameter should be for Colt .36 cal and Colt .44 cal? I know in my Shiloh the .50 is really .511 or .512 and the .45 is really .458 - .459. Is it the same with cap and ball revolvers? Do you put a wad with a grease cookie in them then the ball? I know to seal off the cylinder chambers to prevent multiple chambers from firing.
Thanks in advance for any help.