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Just so you know..I have a good friend who is a plant manager for air liquid here..He makes/handles these gases everyday, including pressure testing the bottles..He advises not shooting a pressurized tank...Just so you know the tanks are made from good chromemoly, they are aprox. 3/8" thick and my 300 RUM blows right thru them at 100 yards..
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Acetylene tanks aren't all that thick. Acetylene can't be stored at high pressure. The tanks are more of a wicking fixture, then they are a pressure cylinder.
The tank is filled with material--they're not hollow. You won't get the expulsion of all material that you are thinking you'll get. Tank pressure on a fullish cylinder is around a little over 200 psi--not all that much, when compared to true gas cylinders.
If you're going to do this, OP...just stick a lit road flare in the ground behind the tank. No problem with ignition.
...not that I've ever done this. Of course, I never have.