I'm not talking about the vane/fletching/nock all together as 1 piece,but the nocks alone. I have used feathers for 30 years and they have served me well. With all due respect roscoe-it sounds like you need to help your buddy with form/tuning/setup as 4-5" is good grouping @ 35-40 yards NOT 20! I build my own carbon arrows and am currently uning standard nocks. I have some of these nocks ordered and will share my opinion as to accuracy as soon as I can compare turbonoks and regular nocks sids by side.