Oh yeah. As far as diposing of "that stuff" ... call OSHA (they do house visits now) or EPA (it's really nasty stuff & if you open a cartridge & can see it, it's in close enough proximity to kill ya) or you can take it out back & carefully light a match to it & watch it burn just like any other gun powder.
Don't have your head right over the top of it, BTW.
Or you can really just throw it in the garbage can. Probably wouldn't hurt to soak it a few in water just for grins.