I've just bought a pair of Kentucky smoothbores in .45

Now the percussion job is straightforward enough I have Pyrodex for my pistols and caps etc

Apart from changing to Pyrodex R that should be pretty much as per my percussion revolver, however I also bought a similar flintlock.

So where can I get flints?

What do I use as priming powder can I use the same as the main charge or does it need to be finer?

Do I really need proper BP rather than pyrodex?

All help appreciated

Richard