If its a 58 cal. I have a reproduction 58cal Zouave, I started with 70gr 2f, sometimes shoot 80gr 2f. I personally use Crisco fill the bass and the lube groves the best you can at home find a container that will hold them firmly so they don't roll around on the way to the range, pick em out load em up and have fun. Some use Crisco mixed with paraffin wax I find it easier to just get messy at home wash my hands. Make sure to bring paper towel or the grease will get everywhere, when loading. Buy some of the liquid bp solvent buy a cheep 1/2" dowel and put a wet one down followed by a dry one between each shoot, this will allow you to shoot all day and cleaning much easier. Lastly if you can find a copy of the Lyman black powder book BUY it.
http://www.amazon.com/Powder-Handbo..._UL160_SR116,160_&refRID=164KPAE25747WYZGXXF4