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KE / Speed ????

523 Views 7 Replies 8 Participants Last post by  cbmac
I shoot 70# 29" bow my arrow is 28" long and 400 grains on the nose. what would it do to my KE if i started shooting a 75 grain head instead of a 100 and how much speed would i pick up?
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I am actually getting over 300 fps with a 400 grain arrow exactly at a 29" draw and 75 lb pull. getting 80 lbs of kinetic energy
 
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