You could do almost anything short of a hot rifle round to a SCUBA tank and not have it rupture. They are very overbuilt. Even if you lopped off the valve it will only vent. Over pressure will vent via rupture disk. I know people that strap them to their backs and bet their lives on them all the time. 
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http://vimeo.com/29896988
“Those that can make you believe in absurdities can make you commit atrocities.” Voltaire.
"There is grandeur in this view of life...." Darwin.
The mountains are calling and I must go.
“The earth has music for those who listen”
Shakespeare.
You Matter.
(Until you multiply yourself times the speed of light squared. Then you Energy)
“We’ve got lots of theories, we just don’t have the evidence’.
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