Some friends of mine had a cannon that blew up on us on the 4th. One of the rocket scientists decided since we were out of black powder to use smokeless. The largest chunk weighed about 5 lbs and we found it lodged in the dirt hill after it passed through a VW bus. There was a lot of damage to property, but it was absolutely a miricle that nobody was killed or injured.
Unless confined in fixed ammo, smokeless usually just burns & fizzles. Howja manage to make it go boom?