I was visiting a lgs today and the owner showed me a powder hopper on a hornady lock n load powder measurure that had melted because he had left powder in it for a long time. When he called hornady they asked him if he left powder in it for a period of time, but they gave him no explanation. Has anyone ever heard of this. Maybe its common knowledge, but i have never heard of this. What would cause it to melt? My gunpowder sits in plastic jugs for years and doesn't melt. It could be the type of plastic, but I don't know.