it really has to depend on the weather conditions where you are hunting. If its raining, and foggy, and misty, as well as cold in the morning, but warms up each day, you had best pull the ball and empty the gun out every night, to insure that the powder is dry when you load it the next morning. It has everything to do with condensation in the barrel, and not much else. People who live in the Mountain states have extremely low relative humidity, so even when it snows or rains, they don't have a lot of trouble keeping the powder dry. Those who live and hunt along the coasts, or here in the midwest, have much higher relative humidity, day in and day out, and you have to clean the gun daily to have any real assurance that the gun will fire properly the next day. Yes, I have left powder in my gun over night, and the gun did fire the next day. I have tried this in all weather conditions. The hick-ups always relate to higher relative humidity days. Our winters can be very cold( and dry) but unfortunately ,if the sun comes out, the humidity rises dramatically, even when the temperature does not get to 32 degrees F. So, dumping a charge even in bad weather hunting is often required, or you hazard a hang fire at the least, and a misfire at worse. Either can wound or lose an animal for you.