Siotwo, it's not an energy deal. Heck, an '06 will do the job. What's important is the shooter's abilities in judging range and wind, among other factors in rifleman skills.
It sure doesn't hurt to shoot a good bit at 400 and 500 from hasty-rest positions. That's probably a lot more important than remaining energy of the bullet. I'll bet a hit in the neck from a thutty-thutty will do better than a gut-shot from a Hotsy-totsy Magnum.
Art
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