Since so many traditional shooters are giving these a try I'll start the thread to share tuning tips. 1. unless your bow is over #55 or you have a high FOC stick with the 500's even though the Beeman chart suggest a heavier spine. 2. consider all fletching the same color; the nocks on these arrows are turnable and this gives you some options when trying to line up broadheads to lie flat or vertical(each required screw in adaptor is slightly different in it's threads)instead of being committed to one cock feather.