I was watching mythbusters today and they was building a paper crossbow,to simulate what some prisoner done to another inmate with a crossbow made of paper.To cut a long story short they was talking about kinetic energy,he had a chart of different power levels for different quarry.And the chart says that you only need about 24ft1b to despatch a Bear,and 65ft1b for a Bison.Surely that must be wrong don't you think?
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I think you'll find they were refering to actual energy needed to dispatch and not muzzle energy. HTH
If the roll of wire you are about to use has more than two ends, take it as a sign that you're about to have a bad day