After watching these two videos and looking at Dom's website to check out the max powder load for this thundermug, I have a question. A friend of mine gave me a several cans of black powder that his father had and wanted to dispose of. Several grades were included. Cannon grade up to or down to FFFF. Included with it was an eight ounce can with a cool picture of an indian on it. He gave it to me because he knows I have a few cannons and mortars. The question is, can I safetly "dispose" of this powder using a thudermug such as the ones shown in this thread? This powder has some age to it as the FFF and FFFF appears to have stuck together around the cover. I tried some cannon grade in my golf ball bore Parrott (750 grains) and it did not boom at all. It just sort of wooshed and made a spectacular display of sparks in front of the barrel.