Just watched the Discovery Science Channel show on anvil 'tossing'. The basic idea for the standard competition is to set a 100lb anvil upside down on tamped and leveled ground. Fill the opening with a pound of black powder. Put another 100 pounder on top. Light fuse and run - heads up! You get one point for each foot of altitude and minus 3 points for each foot of distance between the landing site and launch base. Kind of like bowling ball spot landing with the ball replaced with the anvil and the rest of the rocket eliminated. Except for the raw propellant, that is. I added a screen snap but the Interweb is full of photos and videos.