Cripes, that sounds like the modern day equivilent of the old EC Flash powder that was used to load blanks for the military and for purposes not unlike those you mention.
Numerous guns have been destroyed over the years by people pulling the powder out of blanks and using it for loading regular shells.
Not a good thing to do at all.
Beware the man with the S&W .357 Mag.
Chances are he knows how to use it.