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Hot air carries more moisture, not less. This is why compressed air driers use refrigeration to achieve the -40 degree F dew point.
To try to remove moisture by vacuuming out a pipe would be interesting to watch. Ever hear what happens in a hyperbaric chamber? And you could probably not draw enough of a vacuum without a good pump.
Heating an ammo can and sealing it would be fun, especially the part of the process that involves opening the can. Let's see, assuming you draw 8 psi of vacuum, that would take abour 500 lbs of force to open.
Just a greasy gun in an ammo can with a bag of dessicant will keep it good for a decade or more.
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