With the higher cost and limited availability of black powder, people may be tempted to use Pyrodex as a substitute. DON'T DO IT! Pyrodex has a reduced sensitivity to ignition and needs to be compressed to reliably ignite. At a given volume, it also generates more explosive power than black powder. That's a really bad combination for people firing blanks. In the smoke and excitement of the battle line, a man may not notice that his weapon didn't fire. After a couple of unfired rounds, the Pyrodex may well compress enough to ignite, causing bad results for the shooter and perhaps the people around him. Even if the weapon holds together, the recoil may be extreme.