I'm shooting 125's with my Axis 340's ! My arrows are 28" and fletched with 4" Bohning vanes ! They weigh 450 grains on a digital scale !

They were shooting good for me at 69# , but I cranked my bow up to 75# and they grouped better ! I shot a bare shaft at 20 yrds @ 75# and it hit with my fletched group(first arrow I have ever had do that) !

Makes me think they are pretty stiff arrows though ! Anyway....good luck !!