The guys gave you quite a Christmas list.

Got to have a powder horn to put that Swiss powder in

and one to keep your Goex in. That clean-out screw is an Allen head anymore. Like bugs11 said, remove it every time you clean it. I generally don't attempt to take it out till it's soaked in hot water a few minutes, breaks the crud loose in there. Another item you might want, if you don't already is a possibles bag to put all your new goodies in. Tell ya where I've gotten alot of my goodies is
www.crazycrow.com they've got everything you need, powder horns, cappers, german silver and brass pill boxes for odds and ends, possibles bags, everything. My rifle likes 80grs. of Swiss behind the 325gr. REAL bullet and with patched roundball I generally shoot 70grs. of Goex. Good luck with that new rifle.