Reading the responses it would appear there is some disagreement on the ideal FOC--ie--9 v. 12. Can someone explain in practical terms how and why a 12 FOC is better than a 9FOC or vice versa? Does the speed the arrow is flying make a difference? My present setup is 10+--I'm contemplating a broadhead change that would change it to a 9. What practical difference does it make? Would I be correct in assuming that the only true test is how broad heads actually fly. Thanks in advance.