OK a perkussionszündung buechsflinte it is!

Off the muzzleloading bbs I read that MCM lube from North East Trading works great on Minie bullets and I will try that. What is the recommended lube for patches for the roundball?
How do Minies perform if loaded unpatched in a smoothbore? And will 28 ga shotcups slide down a .58 barrel?