(1) Bow efficiency was calculated based on 1 foot per second arrow speed deducted for every 5 grains of arrow weight added.600gr / 10gpp arrow weight is the center point of the chart. Then the arrow's spine deflection would be.500". When selecting shafts and adaptors etc below B = Black C = Camo M = Matrix Select component from menus below and Arrow Weight will add up everytime a menu selection is changed. Both involve calculations of mass and weight, but in different ways.
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