It really doesn' t matter what kind of helical you use, right or left, it shouldn' t change your point of impact. The only thing is left helical will loosen your heads on contact. No big problem though. Here is a little secret for ya. I shoot left helical shield cut feathers and what I do is apply a little bowstring wax to the threads of my field points or broadheads and that is enough to keep them from working loose. You wouldn' t believe how well that works. Give it a try oops I just saw the post above me I guess BGfisher beat me to the punch.