OldNo7
36 Cal.
If you use the pyrodex, be sure to clean as soon as possible. To be safe, clean your gun twice, and check the gun every day to check for rust for a week or two.
It's interesting you say that, as I'd used Pyrodex for years on my Old Army and never had an issue -- only when I used real BP did I have to watch it closely as you say.
Sadly, I haven't shot much of either lately................. (Must remedy that...)
Old No7