Down here in the South, it is way to humid to store guns like that. I stored a cheap $49 muzzle loader like that once and learned my lesson quick after I found the crown completely covered in a thick rust later on. Luckily, the rest of the barrel was fine. I now have a proper gun safe with two of the electric dehumidifying sticks mounted in it. Basically glorified aquarium heaters, but they work well.