Well finally got my onza up to the pro shop yesterday, I picked up a dozen easton fat boy arrows they weigh 7.8 gpi with a spine of 400. Anyways i decided to chrono my onza when i was up there and at a 376 grain arrow i got 286 at 62 lbs and 29 inch draw im pretty impressed thats got a butt load of kinetic energy and its flingin that arrow plenty fast.