Trust what the chart tells you and don't let a sales clerk at a sporting goods store try to convince you that a different shaft will work just as good. Although many arrows can cover a draw weight span of 15 to 20pounds; variables like arrow length, cam type,and point weight reallylimit the ideal spine for a given arrow ashaving a usefulspan of maybe four or five pounds of pull weight.

For instance, I can shoot an Easton 500 series carbon arrow of 28" long, with a 100 gr. field tip, in my Hoyt Pro Tec set a 55 lbs - and be OK. If I go to a Mathews Solo Cam, I need a 400 series with this arrow at the same pull weight - the 500 is too soft. Or if I drop in point weight to 75 grains, I also need the 400 series. But I could decrease the arrow length to 27" and be OKup to 56 or 57 lbs. of draw weight with everything else the same. Longer arrows, heavier points, and speedier cams will generally make a given arrow "softer" in terms of its flex under load - at the same draw weight.