ABANA, the national organization came out against this activity, because of too many close calls. I have worked with a guy that spent 4 months in a burn unit, when the powder went off prematurely. One well organized anvil shoot went like this. In a grassy meadow, had a rope around the area. The crowd was assembled, and the team went out to set and light the fuse. When they were running away, a curious 3 year old started running out to see what they did. Luckily he was corraled in time. With the price of a good anvil, and the general change in society which includes not watching the kids, and liability insurance for any event, its an activity whose time has passed on by. The Civil War re-enactors I know, believe the anvil was shot as a warning, which could be heard for a mile or two. Besides, I had enough of loud booms while in the Army.