My bow shoots at 304fps easily and still I have 71ft. lbs. of kenetic energy. Just because a bow is fast and the arrow isn't a piece of oak timber flying thru the air that it doesn't possess the capability to put out the energy. 71ft. lbs. I would think is more than enough to take down a elk at 50yds. I'm sure it has been done with less. How fast does your bow have to shoot before you are a SPEED FREAK/IDIOT?