I agree with tfox. anything between 12 and 18 is pretty much identical. I spent money finding this one t. I used to have 13%FOC and now have 18%FOC and really not much difference at least for the price.
I changed my 4" vanes to 2" Blazers on my stock 29" arrows and seem like they fly better! Probally not much change in FOC from stock.But my 20%FOC arrows now I can tell they flight noticably better,maybe slower but a little cross breeze doesn't effect them like the others and they thump the bag target.Removeing the 12-15%FOC's from target I have to pull them with b/h,the 20% arrows I just unscrew the head sticking through other side before removing!
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If it weren't for hunting I wouldn't work! Gotta pay for my vices somehow don't I?
05 Diamond Victory(thanks Greg)