Go to your local Pharmacy and pick up a small box of those alcohol pads. You know, the ones that are individually wrapped that people use to give themselves an injection.
Once you have fired a shot (Let's assume you have missed....even though we all know your such an eagle-eye
). Use one of these alcohol patches to wipe down your frizzen pan, and your frizzen, and your flint. There is nothing (and I mean NOTHING) that will attract moisture faster than powder residue!
So, if you have powder residue on your gun from....oh say a early missed shot....and you reload, in half-an-hour that powder residue will "suck up" a bunch of the moisture in the air....and it could very well cause your next attempted shot to be a mis-fire. (Ask me how I know?)
Now, if your reloading quick for another shot....don't wipe it down...just reload. But once it get quiet again, dump your pan powder, wipe it all down with a patch, and then re-powder your pan.
The alcohol will evaporate in a few seconds. I can tell you since I started doing this, I've had very few "clicks" on my second shots....after my first "misses."
You can also use the alcohol patch to run a quick swab down the barrel if it's getting a bit fouled. Again, it will dry in seconds and allow you to reload quickly.