While not particularly good, it's not bad either: I'm immune to the smell of cow dung. Pig, sheep, horse, etc smell horrible. But Cow shit is perfectly OK. Guess which animal I grew up with.
LOVE black powder. Whatever's in my AR-15 shells is foul though. No other round bothers me. .22LR, .22MAG, .380. .45, any given shotgun shell, no problem. Every .223 round smells awful.