I've seen one person, Scott Stokely, pop a drive that was over 500. I've played with good players in IA and TN and 600 is absolutely ridiculous, unheard of, and I'd have to see it to believe it. Around here in middle TN I've seen some people maybe hit 450. With a perfect tailwind and perfect snap I once threw a dx valk in the neighborhood of 425-450. On a good day, according to the signs at my local course, I can throw a gazelle/teebird on a controlled straight line for 375-400 ft (prob more like 350-375, I suspect the signs are wrong), and a valk/beast/wraith will add about 30 ft on average on open holes when I can afford to have the s-curve play. There must be something in the water up there in MN!