Thanks for the replys. The Huntersfriend site was exspecially helpful Double edge!! As for my bow, its nothing fancy Blodg, Its a PSE NOVA set at 66lbs, a 29 1/2 inch draw length, 62% let off. I'm shooting Carbon Force 400 arrows with a 125 grain fixed broadhead. (Steel Force) It seems to scoot along pretty good but I'm fairly certain its not shooting the posted 295 f.p.s. IBO speed, But, I've never shot through a chronograph. So..?? I was always interested in how the manufactuers came up with these numbers and I appreciate the help. I have thought about shooting 100grain heads but other than that I really like my set up and it seems to work well, as long as I do all I need to. Thanks again for the help!!!