I recall the mythbusters doing something similar.

From my SAS- survival handbook: Remove half the gun powder from the cartrige, put that on your tinder.
Put a small cotton pad into the cartrige. Load the cartridge in the weapon and fire.

I'm not relying on this one.
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''It's time for Plan B...'' ''We have a Plan B?'' ''No, but it's time for one.'' -Stargate SG-1