How important is your FOC %

[wapitirod]

That brings up another question, when your figuring grains per inch on an arrow are you counting the finished weight with fletching, broadhead, etc or is it bare shaft?  It's been since the early 90's I was really into shooting traditional. I started out shooting a compound instinctive and when I switched I just did the same things.  I'd go by the spine charts and buy some arrows and then I'd buy whichever broadheads I was using at the time and I'd shoot.  It was never anymore complicated than that but since I've gotten back into it and been on here it seems things have become more complicated.

[Flying Dutchman]

I agree with Kirk. At short range you won't notice much difference. I shoot till 60 yards and then the difference becomes quite obvious. E-FOC gives a much less flat trajectory. Below the 8% your arrow becomes less stable. For me 10% is just about right.
On my Sitka 11/32 woodies I use 100 grains points which gives me a FOC between the 9.5 to 10%. I like a 10% FOC. I am going to develop some carbons. One of the starting points is a 10% FOC. BTW on the calculation form of Goldtip you can see that the recommended FOC is between the 8 and 10%.