I was recently given my father-in-laws old shot shell press with some old shot, greendot(?) powder and plastic wads. I'm sure the shot and wads are fine but how long can old powder still be considered viable? It has been stored in a temperature controlled (mostly) shop. I know I have a ton of learnin' to do and look forward to the exploration. If the powder is bad, how do I dispose of it properly? The eternal teenager that resides in my brain knows what to do with it, lol.