I haven't chronoed the bow. The bow is a Truth 2 set at 65 lbs and 29 inch draw with a QAD Hunter rest. The arrow that it appeared to like (Predator 200)was a total of 370 grains. I know that form does have to be a factor. One shop guy was able to shoot bullets with a properly spined 400 arrow (however, he is a professional shooter). I know that my form isn't perfect, but the pro shooter said the good thing about me is that I do shoot consistant. I may tear slightlywith the "properly" spined arrows, but my shots or "tears" are pretty much the same with most the arrows I've tried. I was shooting bullets with the Predator arrows every shot. So I don't know what it is about that arrow that "compensates" for my less than perfect form. Just not sure what to do at this point. Obviously I will keep working on improving my form.