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Regardless of one's personal view about the usefulness of the information, energy numbers are included on a lot of ammunition simply as a point of comparison.
It's like 0-60 mph times for econo cars and light trucks .... not very useful, but a point of comparison between models.
And for some cartridges, the energy number(s) are included because the cartridge meets some magic number that has been adopted as a requirement for a specific application.
.327 Federal Magnum, for example, listed energy figures on the ammunition when it was released, because the American Eagle 100 gr soft point load met the 500 ft-lb energy requirement for hunting big game in certain states; and the other loads included the information to show that they came up shy (and were illegal in those states).
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Don't even try it. It's even worse than the internet would lead you to believe.
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