Safe heats and the seals expand. Powder hit critical temp and KABOOM!!!!
I dont think its safe in any way. Although 8-10lbs of powder would be very impressive from 300-400 yards away. 
http://www.youtube.com/watch?v=mYKxwWZ-aRM
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Concentrated power is not rendered harmless by the good intentions of those who create it.
Milton Freidman
"If you find yourself in a fair fight,,,
Your tactics suck"- Unknown
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