Quote Originally Posted by robinghewitt View Post
Pyrodex doesn't work with flint, can give a delay on a percussion shotgun and has a funny smell.

I think it is good for cap'n'ball pistols but I don't shoot those

As said it is a propellant not an explosive so no certificate required.
Pyrodex is fine in Percussion Smoothbores I have used in 20g. .600 approx. Instant ignition.
Can't be used in Flintlock's.
Cleaner burning and easier to clean after use.