I believe in unloading each day after the hunt. A quick run-thru with a dry patch and then call it good. I have left one loaded for a few days in the past, only to miss a chance at a late season doe due to wet powder. Temperature changes will cause condensation, which will affect performance even if the gun still fires. After hunting on especially humid or rainy days, I consider it a must to discharge the gun. It is better to be sure the gun will fire than to take a chance in my opinion.