For FITA field, the 1st day is unmarked distances so a lighter arrow will help getting you more speed and therefore more forgiveness if you mis-range a target. I shoot Victory Vforce HV 400's and I am getting 280fps. On the other hand, shooting FITA target in an open field would require a heavier skinnier arrow to minimize wind drift. Like an X10, CX Nano etc. I hope this helps.
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