I used to fire the load out at the end of every day's hunting. Then I stopped doing that and just put a cover over the nipple. After removing the cap of course!

I doubt if the nipple cover would have kept any moisture out, but I don't remember having a misfire/hangfire the second day. I think this was during my Pyrodex days.
Nowadays I would plug the nipple somehow and not worry to much about it since I've come home to BP!

My Dragoon revolver is sitting in a safe, charged, and I'm not worried a bit about it not firing when next I take it afield. 'course it's tightly capped and each cylinder is covered with grease so I figger it's pretty moisture proof.
BTW, in Jawja a ML is considered unloaded if the weapon is uncapped. Even if there is still a charge in the barrel. I don't know what the law is where you are.
