I'm gonna go against conventional wisdom on this one. My two "go to" bows are a 43# Lost Creek longbow and a 45# Samick Stingray. Both of them are tuned perfectly with a Gold Tip 35-55 Traditional blem shaft, 29.25" long, with a 145 grain head and the regular inserts. I can slam bareshafts into a fletched group, shoot a bullet hole through paper, and shoot broadheads like lasers out of either bow with this setup. Don't ask me how it happened - I thought for sure I'd need at least a 50grain insert added, but I tried that and the arrows were flying weak out of either setup. With the regular inserts the arrows are perfect out of either bow.