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The effect of different pile/insert weights will vary depending on where you are on the arrow spine scale. A 20 grain change in point weight will have a different effect on the dynamic spine of an ACE 720 arrow to a 430 arrow. I am sure the poundage/speed of the bow will also cause variations in the effect of different point weights on the same arrow. There are too many variables for one simple formula to work in all cases.
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DeeBee {τΏτ}
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