Sorry for the confusion on my part. What I was wondering is say I have some arrow that shoot perfect with 160 grain with a spine of 55-60, but I want to use a woodsman head at 125 )grains (with a chisel point added around 123 grains) or want to use the new single bevel no mercy with a weight of 125 grains after final sharpening. About how much should I reduce my spine without buying a test kit.
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