Thanks Awshucks for saying that cause I forgot that them numbers in my post are ment for long bow arrows. I cant remember where but I think it was on a horton sponsored hunting show they talked about it for CB and it is supposed to be between 15-20% for CB arrows. Mine are always between 18-20% with standard horton arrows and 100 grain head. when I used to shoot the off brand that wal-mart sold I would have to put thin washers on the front to get it right.