I know a guy who used black powder to remove a large stump from his front yard when he was 16. His father had tried to dig it up w a backhoe for hours and told his son he would pay him $100 to get the old, rooty oak stump out of the rocky red clay. I assume his father thought he would use the backhoe but he used a brace and bit and welded extentions to bore deep into the stump and poured black powder down the hole, he used what he thought was enough, and added just a little more. He then dropped a long fuse down the hole and filled it w sand to the top, packing red clay in near the top. He lit the fuse and hid behind a large tree. The stump exploded w an earthshaking Kaboom that shattererd it into large peices, along w alot of his and his neighbors windows, while raining pieces of rock and wood down on the roofs, doing more damage that he spent the rest of that summer repairing!!!