AB, think of FOC as a measure of stability. An arrow with a high FOC (15%) would have a heavy nose and tend to have good broadhead flight characteristics (all things being equal). The drawback to this is decreased range. Arrows with high FOC tend to drop off quicker at ranges of 30+yards. Some 3D aces shoot FOCs of 7% because this gives the arrow a very flat trajectory. The nose it light so the arrow carries well at range however if that arrow had a broadhead instead of a field tip it would more than likely wander significantly. Hope this helps.

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