The hat question was a real inquiry. With all the sparks and open ignition the question of catching your hair on fire, that's all...I went to the black powder shoot at my club today. It was an informal shotgun/rifle shoot. Imagine being in a deadly duel for your hearth and home and having just a BP weapon. That idea scares me and I have a new respect for the men that fought the Revolution with similar arms.
Eh, I have long hair and never felt once that It was in danger of ignition. The flash is far enough away that it isn't an issue. I would be more concerned with my eyes.