I have been given six ST Epic 340 arrows, but my usual spine is 400. I shoot 150 grain heads and Flex Fletch 360 vanes. My HeliM is at 64 lbs. I don’t have the software I’ve seen used here, and the charts I do use don’t have a 150 grain option for the heads.
How long do these need to be to get proper spine and good flight?
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