Using black powder multiplies the moisture problem 10 fold. This is why I discharge every night , clean and reload next morning. As wmi said leaving BP guns loaded for any length of time will at some point prove to be expensive. I can see where pellets would give you some additional hunting time without reloading, but for me I need additional assurances that the darn thing will go off. Also for us flintlock shooters the vent hole is a prime entryway for moisture to get to the main charge. On my TC firehawk I'll leave it overnight loaded and just put a a new musket cap on each morning. I don't hunt much with the inline anymore.