There was more going on than simply shooting the tank.
Where was the ignition source?
My bet, some distance away.
OTOH a friend of mine did 3 inner tubes full of Oxy/acetylene and
brought the cops from 3 miles away. He wanted to do it in front of my
house but I wouldn't let him. +
I don't know what the details are. All I know is what I read in the
paper the next day and the police report. They said someone reportedly
shot it with a rifle and it blew up. They were also shooting off
fireworks and other 4th of July type pyrotechnics so maybe that had
something to do with it.
I always thought those propane tanks were considered safe because they
couldn't blow up.