Today, for the first time I shot over my chrono. I've used it while reloading for firearms many times but it just never really occurred to me that I might want to send an arrow over it. Anyway, I changed arrows recently and decided to go heavy (Carbon Express Piledriver). Since I'm cranking up the weight of my arrows I figured it would be nice to calculate my KE.
Out came the chrono, set it on a 4' step ladder and fired 5 arrows over it from 5 feet back. I am shooting at 65lb draw, 29" draw, and my arrows/broadhead combos are weighing out right at 485 grains. All shots were consistent at 251-252fps and when plugged into the KE equation with my arrow mass that give me right around 68lbs KE.
I guess I am happy with that. Anyone else shooting arrows weighing well over the standard used to determine IBO speed? I believe they use a 350gr arrow, 30" draw length, and 70lb. draw weight. If so, what kind of numbers are you getting?
