ORIGINAL: dbleyepatches
Dumb question but do you measure the distance from the balance point of the arrow and divide the distance forward of the balance point by the distance behind the balance point to get the percentage? (Damn I hope all of that makes sense to somebody)
See the attached link.
In the link you will notice that it gives the reason why you select FOC and it does not say anywhere in there "So I have a male arrow that will break through bones."It is used to fine tune an arrow for long range target competitions.Notice though the chart of different FOC's that are commonly used.
There is nothing wrong with being over the 15% but being under 10%may cause instability in a broadhead. As I stated previously there are benefits to having the weight forward on a hunting shaft. Especially if you are not shooting a high speed bowor or a newer high draw weight bow that can not produce a large amount of momentum/penetration/KEwith a 5-6 GPP arrow. I actually believe that if you shoot a slower bow you should use as much FOC as you can to ensure that as much force as possible is not lost on impact. It seems a lot of people that I talk to outside of HNI are around 12% to 13% that have 60to 70 lb draw weight bows.
http://www.socalarchery.com/Information/front%20of%20center.htm