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Oh sure, release all that greenhouse gas just to cool your barrel. AlGore would have a double coronary, LOL!
Cold gas does work, but it's seven bazillion times more expensive (and heavy!) than a liter bottle of water that'll last for six or seven coolings.
Don't fret the water. It flash evaporates in that hot barrel (that's HOW it cools). If it bothers you, pull a boresnake through afterwards. But it'll come out dry unless you pour the whole liter of water through the barrel. Two or three ounces will do.
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