Hi Craig
I use blackpowder in two flintlock pistols, a musket and a .451 Parkerhale volunteer rifle or as the boss (aka the wife) puts it ‘my cap gun’.
my pistols are smooth bore – cheaper than rifled easier to load obviously less accurate but hugely enjoyable, yes I can spend time prating about with flints but sometimes I can get a run of twenty plus shots without a single flint problem. I need bp in the pan but have tried Pyrodex and 777 in the pistols and musket plus the clubs revolver.
From this I would list the following:
Pyrodex – expensive, corrosive more so than bp in flintlock cause a considerable delay between ignition in the pan and the main charge which is not good for the aim. Needs lots of washing out as it is still cruddy.
777 – more expensive than Pyrodex but you down load as there is more pressure per grain, so it lasts longer. Burns bloody hot so breach really heats up with just one shot, which to be honest concerned me. The 777 doesn’t produce so much crud and it washes out with cold water, which also saves on buying bore scrubs etc.
BP – cheaper unless you buy Swiss or high performance powders, all bp powders make a crud which has to be cleaned out however some powders make more than others. A brush out in shooting is sometimes required. Cleaning needs time, bore scrub compound washing up liquid and a lot of patches and changes of warm water, then gun oil when patch comes out clean.
I tried revolvers and as enfielf2band said I didn’t like the faff of loading plus all the mess of the lube that with a lifelong interest in flintlocks made my mind up for me to go for flintlock pistols.
I would make one final comment, if all our pistols etc are true replicas of the original items in bore size, dimension and rifling. Then the rifling’s twist was made for bp which will have less oomph than Pyrodex or 777 which means that the ball or bullet should be rotated correctly. I say this because one of our good pistol shoots at the club I frequent tried some of my bp in his Rugger and has changed over from Pyrodex to bp because it improved his shooting.
Whichever way you go enjoy the shooting.