Smokeless powders are classified as "Propellants". Black Powder is classified as an "Explosive". HUGE difference. In a fire, HOPEFULLY the can is soft-soldered. If so, the solder will melt (in theory) so the BP will not be "contained" and (again, in THEORY) just go off like a tray of flash powder (Think old west type photos) and not be a bomb. Just store it in a cool, dry place and you'll be good to go. I've had bp that was 10+ years old work just fine. It doesn't deteriorate like smokeless does. If you feel the need to dispose of it, pour it in the yard and thoroughly saturate it with the garden hose and watch it disapear. There's a reason for the order "Keep your powder dry".
Also, NEVER, NEVER, NEVER, NEVER EVER load a bp rifle or musket directly from a horn or flask. If there is a glowing ember in the barrel, the new powder being poured into the barrel will ignite and the flame will find its way into the flask or horn and now you'll be holding onto a bomb, the consequences of which can, and probably will be, deadly.
Jon
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