Patches is something you can experiment with for optimum accuracy. You can try .015 or .020 Oxyoke patches or go to Wal-mart and pick up some pillow ticking, wash it then cut it up for patches and lube them. You can cut it either in squares or strips to cut off at the muzzle. You can use any lube you want. I like to use olive oil as a patch lube. But you can also use canola oil, crisco or some commercial patch lube.
Tip" don't lube too many as they will deteriorate if setting too long.
As for a load using Pyrodex RS. I'd start with 80 grs and work up to 100 gr. (by volume)