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So by luck, I came into possession of several 130g CO2 cartridges. My question is simply if anyone knows what volume a 4500psi 130g cartridge will bleed off into and create only 200-350psi... I have a pneumatic rifle which has its own <=350psi to 5-125psi regulator which runs through a hose to a backpack... I will be building a new chamber with the above volume in question, which I can hopefully put one of my cartridges in( they have 1/8" threads which fit to my thread reducers I use for schrader valves) so that I can have a portable renewable power source for the chambers in the pack... other than a bike pump...Thanks, The Dax

Possibly use Boyle's Law? http://en.wikipedia.org/wiki/Boyle%27s_law

If it's CO2, it won't be at 4500psi. (Let's hope!)

There is a handy little chart that will help you figure such things here; (Not to mention the entire thread.)

http://www.spudfiles.com/forums/how-muc ... t7133.html