People get way too worried about such things as KE and arrow speed. For the most part, they are meaningless variables. Set up your bow to send a correctly spined arrow with a lot of weight up front, in a straight line, and you'll probably kill what you're shooting at.
A buddy of mine just got back from a buffalo (bison) hunt. He took a 1300 lb bull, shooting a 58 lb compound and a 600+ grain arrow. It took 2 shots to bring it down. Both were complete passthroughs in the ribcage. He wasn't worried about arrow speed and I'll guarantee you he has no clue what KE is. He knows how to take down large animals and what makes a good hunting arrow.
Another rule of thumb: Any KE recommendation that doesn't include all the variables is a load of male bovine dung.
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