very approximately:
very fine priming powder: ffffg
fine powder: fffg, swiss#1, pyrodex P
medium powder: ffg, swiss#2, pyrodex RS
coarse powder: fg, swiss#3
very approximately:
very fine priming powder: ffffg
fine powder: fffg, swiss#1, pyrodex P
medium powder: ffg, swiss#2, pyrodex RS
coarse powder: fg, swiss#3