If you don't own the material yet, Buy Dutch Schoultz's Black Powder Accuracy system, for just under $20.00. It is the best information you can have in working up loads for any rifle.
http://www.blackpowderrifleaccuracy.com/
You should be able to use a .530" ball in that gun with a .015" thick mattress ticking cotton cloth patch. BEFORE shooting the gun, make sure all oils and other compounds in the barrel have been removed, and the bore Polished with some tight cleaning patches and some abrasive. I use Pearl drops toothpast on a damp patch, backed by a dry patch, on my cleaning jag- not a loading jag you put on a ramrod--- to do this kind of work. It usually requires several applications of the abrasive to the cloth to get the burrs off the lands, and get the bore feeling truly smooth.
Check the crown of the muzzle, and the front of the lands. If any land has burrs or sharp edges, you will see cut or torn patches. Use a carriage bolt to back fine emery cloth to polish the crown and remove the burrs and sharp edges from the lands.
Some very good shooting is done at 50 yards, with Hawken style rifles in .54 caliber, using the .530 balls and the .015" ticking. Lube the ticking the night before you go shooting, so that the lube has time to fully penetrate the fabric. If you buy fabric from a fabric store, be sure to wash it a couple of times to remove the sizing that manufacturers put in the cloth to help it lay FLAT, so they can put more cloth on the bolt for shipping. Sizing is like Starch, and it will resist any lube- or liquid from penetrating the fabric. Inconsistent lube is the cause of a lot of bad groups. Again, read Dutch's materials.
Best wishes to you. :thumbsup: Get a solid range rod, and a separate Cleaning jag to put on it, with a muzzle protector, to use for loading and cleaning the barrel. Leave the wooden Ramrod in the gun to load the gun for a second shot in the woods, when hunting, or when you are shooting any kind of trail walk, where carrying your Range Rod may not be allowed. :hmm: