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Joules are the international unit for energy, and 21 joules is equal to about 15.5 foot-pounds, which is the unit used for ballistics in this country. A 7.7 grain lead pellet (assuming .17 caliber) that has 15.5 foot-pounds of energy will be traveling about 950 feet per second.
That's a pretty zippy pellet rifle, plenty to put down game smaller than a bunny. If you brain a groundhog with that you might put him down too, but good luck, ghogs are tough.
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