Energy figures, where projectiles are concerned, are nothing but largely irrelevant figures derived from mathematical formulas, formulas that tell us absolutely nothing about how a bullet will perform in flesh and bone. Their only use might be to compare the terminal ballistics of bullets of similar caliber, weight and construction (e.g. .338" 225 gr. bullet vs. .358" 225 gr. bullet or a .277" 150 gr. bullet vs. a .284" 150 gr. bullet) at various ranges.
Projectiles with similar energy figures but with vastly differing terminal effects:
.243/6mm 75 gr. HP @ 2700 fps (varmint bullet)
.458" 400 gr. SP or cast WFN @ 1500 fps (large/heavy game bullet)
.224" 55 gr. HP @ 2700 fps (varmint bullet)
.429" 260 gr. Cast SWC @ 1250 fps (medium game bullet)
.223" 27 gr. LRN (.22 Short) @ ~1100 fps (plinking bullet)
1" 2 lb. lance/spear @ 50 fps (put food on the table since the beginning of time bullet)
.043" 15 gr. sewing needle @ 6000 fps (for sewing really fast)
.308" 150 gr. FN soft point @ 1900 fps (staple for deer hunting for 100 years)
35W