Make sure the vanes are at 4-7-12 o-clock position if you dont nock em right you can get contact on the bottomif one vane is at 6 o-clock and this will make the arow fly bad....Ive ben useing the WB since they came out,right now Iam shooting Beman ICS 340 Hunters and dead on at 20 30yrds...and group well at 40....also put a extra dab of fletching glue on the front of the vanes.....