Jack,
A bit off the topic of good loads and methods, is considering the type of gun you'll use them in. Most every gun WILL work to fire them obviously, but clean-up of some action types (like a boxlock) can seem more daunting when the same BP gases that foul your barrel work their way into the frame and locks.....which they will.
The most easy mechanism to clean is that of the hammer guns, as any blow back passes out the striker holes, through the nipple hollows and beyond.....to where occasionally cleaning the striker works is sufficient.
For the hammerless sidelocks, an occasional removal of the locks and
thin coating of the exposed metal surfaces of lock and frame with something like RIG grease (following cleaning) will do the trick handily.
Tougher are the boxlocks, that should be stripped downed and similarly coated on their interiors at some point to ward off that thin film of surface rust that will form when hygroscopic gases and particles are deposited and left to sit on unprotected metal.
Some of this blow-back can be mitigated if you don't mind an extra step while loading your black powder rounds.....and that is by lacquering in your primer with clear fingernail polish immediately before seating it. Makes for a nice, airtight seal that minimizes gas flowing past the battery cup. I load the Federal papers with the slightly larger dia. Fiocchi primers, lacquer them in, and have no problem with escaping gases.
I even enjoy the slight tedium of putting black powder loads together as it gives me time to reflect on how things used to be done back in those days. (I think you'll find that those shooters gravitating toward loading their own BP rounds are not the impatient types.) But by all means, give it a whirl as there is nothing quite like it.
Robt.
P.S. Be sure to check out:
http://www.republicmetallic.comas Terry Harper has a great 'must-read' section explaining cleaning and chemical reaction when using black powder.