I've got an old hawken style 50 cal I've had for years, killed a few deer with it, most of the guys I hunt with have all got modern in-line muzzleloaders now, I'm still hunting with the old fashioned one, leather possibles bag and steer horn powder flask, ( always like Daniel Boone and Davy Crockett when I was a kid ) I'm still using real black powder, even though I understand pyrodex is more efficient, I kinda like sticking to the old ways !
I don't think you'll regret picking that throwback up, enjoy !
Actually, I have found real black powder to be much, much more efficient than Pyrodex. There is no comparison. I think almost everyone who has shot both would agree with me. Pyrodex won't even go off in a flintlock most of the time.