We found a three quarter full 4.5 kg gas bottle once, at a tip on an aboriginal reserve. We had a .243 and it was night time and we were pretty young and sillier than now, so we thought I wonder what would happen if.. ?
Anyway, we put it on a rock. We thought it would be interesting to see what would happen if we lit a clump of spinifex nearby before shooting, same as you guys did with the fire, but decided not to.
Went back to the car and shone the headlights on it, we were probably 80 m away I guess. My mate took the shot and hit it dead centre. It didn't explode - it took off like a helicopter and went straight up, maybe 20 m or so, or more, shooting gas out the two holes and making a massive cloud probably 50 m in diameter. Looked impressive in the headlights. I am so glad we decided not to light the spinifex (google 'bleve'), but I just admit I have often wondered what would have happened if ...?