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A good example of how Kenetic Energy is not a good measure of performance is comparing a 22-250 with 50gr bullets and a 45-70 wiith 405gr bullets. The charts show that the 22-250 has the edge at the muzzle and are virtually the same at 100yds but which had you rather have to stop a charging bear???
Perhaps Kenetic Energy can be used to measure differences in two similar cartridges shooting bullets relatively close in weight but even that is iffy. I feel that bullet construction has way more to do with killing power than KE does. A good example is shooting animals with FMJ's then shooting them with Soft Point bullets. The bullets ability to expand well but not over-expand is paramount to transferring energy and tissue damage IMHO anyway.
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