For my part, the only season I hunted with my percussion, I was in NW Oregon. It was a VERY wet year even for those parts, and its a really good thing I didn't see anything that day.
I was new to ML's and I'm sure its my fault somehow, but at the end of the day I went to discharge my rifle, and got a singularly disappointing "pop" from the cap. No boom... I had no ball puller, and still don't, though somewhere I have a CO2 device that I could use in a pinch.. So, while the sun was going down, in the dark, in the pouring rain, I carefully pulled the nipple off, picked out the flash hole, and applied as much powder as I could cram in there, probably no more than 5 or 6 grains max. new cap, aim, fire..
"POP.............fffffFwoosh! .... Smack!" the smack was a good second or three after and the tree the ball impacted upon was less than 5 yards away...
Now in fairness, as I said I was new to ML's and didnt know a lot. I now know that Traditions doesnt seal the wood under the metal parts. My ramrod was stuck in the channel from the swelled wood, and the stock was in danger of being compromised. I took the rifle down, dried the stock out really good over several days, and refinished the whole thing taking care to seal ALL areas of wood... I havent had the guts to take her out as my only weapon hunting again, though I put it in the truck most times and loaded her a couple of days without rain..