Ok,went to the bow shop and shot through their chrony and turns out he didn't charge me for it..LOL Anyway, My bow is rated for 304FPS,and it is shooting a 425gr arrow at 260FPS..So that gives me a KE of 64lbs..Is that plenty enough to shoot any mechanical head?And my bow is supposed to be a 70lbs draw,but is only 66lbs..Is it normal for your bow to be off a pound or two from the factory setting of 70lbs?