AWWWWWWW, I dont have much experiance in this but one thing I know is that there is no way to get around exparimenting with different shafts. I took me 3 shaft sizes to find the right one, most shaftes in a given range like 2216, 2117, 2020, will all shoot from the same bow and they may all shoot good but one will shoot just that little bit straighter

What do you want to shoot, aluminum, wood, carbon?

If you are just getting into this dont let your self get all wokedup about the perfect shaft.when I started my shooting was so bad I wouldnt have mattered whatsize arro I had.