BULZEYE; actually i did the exact test last year when i decided to shoot feathers only. my bow is a pse nova set at 67lbs at 29" draw i shoot pse carbon force 400 shaft's at 29" with 75gr 3 blade muzzy heads. i use 4" feathers or vanes, now i made up a set of arrows 6 of each and thru the chrono i am shooting 268 with the feathers and shooting 260 with the vanes. doesnt sound like much of a difference but seems the feathers are more stabble than the vanes and i get better shot groups. hope this help's