I will never try to enhance any type of firework with gun powder again. I cut a small hole in a mortar shell and put all the powder used for the propellant. Since there was a lot of room left I grabbed a can of Winchester powder from dads loading bench and filled it up. When it went off it sounded like a cannon blew the window out I the side of the house. Also knocked all the leaves off the trees and set the neighbor car alarm off. It was very colorful.