I am thinking of building an arrow with a higher FOC than my current set up. Bow Set-Up: PSE BowMadness MC 70#@ 27.5" Current Arrow: CX Mayhem Hunter w/100 head Standard Inserts, GT nocks, Fusion 2.1" Vanes Weight= 416 grains @ 10% New Arrow: GoldTip XT Hunter 75/95 w/ 125 grain head 20 grn. Insert weight, Standard nocks, Fusion 2.1" Vanes Weight= 430 grains @ 14.6% So my question I pose is this. How much difference am I really going to see, if any?
I think you'll see the difference mostly in tunability and penetration. Not much total weight change so speed probably won't change much. That's a higher FOC than your current but I wouldn't necessarily call it a high FOC.
This should give a very good understanding of FOC and what it means to arrow flight and hunting. http://www.alaskabowhunting.com/PR/Ashby_EFOC.pdf
FOC stands for front of center and it is a way to measure the weight front of center. How to calculate http://archeryreport.com/2010/09/arrow-foc-basics-calculate/