RE: Shelf Life?
With Black,Pyrodex. and Blackhorn 209 you can store them a long time. Wit APP and 777 I have had them get just erratic enough to drop shots low out of the group, they attract moisture and if the can has been opened they don't seem to seal as well. I live in a extremely humid area [the down wind end of a 40 thousand acre lake] and so I have a bit more to contend with than most. Lee