Do you have a manual?
For .36 cal, you can solder a piece of heavy wire on to a .38 special case and use that as a measure.
The internet is your friend in this case. Search for info on the revolver itself and research for info on black powder revolvers. Black powder is great fun, but you need to know what you're doing or bad things can happen.
“If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams