I would be happy with 14.4%. My current arrow has 17% FOC and any new deer arrows I make will be that high or higher. I wouldn't use less than 12% for deer hunting and probably wouldn't try to get much more tha 20-22%. I also like a heavier arrow (500gr minimum total weight)with that good FOC. I know everyone doesn't like heavier arrows but I think regardless of heavy/light arrowyou need agood FOC. I think a good range is between 12-20%.