I have heard many different schools of thought. Some debated where/ how to measure and what the correct percentage should be. To me the FOC debate is like asking someone if a longer A2A is better than a shorter A2A. (Because we all know that longer is better)
As far as I know no one as scientifically done any kid of analyses that proofs or disproof’s the FOC theory that the theory can equate to a universal percentage for all arrows. (Where’s Mythbuster when you need them)
What I get out of this theory is that the arrow’s FOC will determine how it will behave in the air. Higher FOC will give you a more stable arrow and less range and a lower FOC will give you more range but less stability. So… based off of everything that I have read and people I have spoken with… I set all my arrows for 3D to 8-9% and hunting to 12 -15%.
These guidelines are what I was given from a shooter at my club (which means nothing to me):
Field / FITA: 11-16%
3D : 6% - 12%
Hunting : 10-15%
I also know that Easton gives some guidelines for this also, but can’t get to it because of the fun police at work won’t let me get to the webpage.
At the end of the day, there are so many factors that play with each individual’s arrow that it is hard to say what the correct percentage FOC should be for an arrow. These are just rough guidelines. If you are not shooting pro, hitting where you want your arrow to go and know that your arrow is not 60% FOC, than don’t sweat it
I hope this helps,