Been a few years since my father passed away and he left behind a shotgun reloading station, more lead than i know what to do with, press, empty shells, wads, primers... heck I think I got what I need to reload a whole bunch of shells. But the thing I keep wondering is whether the powder he left behind is viable or not. 2 big metal containers of Hercules Green Dot. Anyone familiar with it? One can is almost empty, and it seems one of the cans is still sealed! I think it's a 4lb can. Worth using?