I keep reading that my crossbow that shoots a 400grain bolt at 245fps is barley enough to kill a whitetail? How is that possible when my 45lb bear Montana longbow easily takes whitetail out to 30 yards with the same weight arrow and half the energy. The website said the short stoke gives it less energy than a vertical bow even though mathematically stroke does not determine for, kenetic energy or momentum of an object. Can someone clear this up to me?
Kevin Watkins
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10,130 Posts
I dont know how Joules are calculated or exactly what they are but a 400gn arrow at 245 fps will give you. 53.26 ft lbs of KE . At least thats what I believe the form of measurement is for this calculator. I'm sure you have enough to kill a deer. With that said your Ke numbers go down the further away your target is. This is where extra weight can be a big help giving you more momentum. Here's the calculator and some articles on the subject Kinetic Energy and Momentum Calculator
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