something my father inlaw would do is load up a field load just as you would normally but instead of adding shot he would melt wax and put it in place of the shot pellet he'd let the wax cool a bit but while the wax was still soft he would then crimp the shell. he would make these to pop off on the 4th of july. they are just as loud as a regular load. I'm not sure how dangerous these could be, he never had a problem with them but just incase I would step back pretty far just to be on the safe side. naturally I dont recommend anything thats not printed in a reloading manual so if you choose to do this its entirely at your own risk. I suppose have fun, and I wish you all the luck in the world that you dont blow yourself up.