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Here is the question before posting on Bowsight or Archery Talk and getting an argument going. I would rather have the argument here . My draw length is 30", draw weight 68# with a release. I am shooting a 29 1/4" arrow, measured from where the point screws in to where the nock meets string. Bow has been tuned to where broad heads and field point group together and I am shooting 100 grain Slick Trick Mags. The arrows are Carbon Express Mayhem Hunters with a .347 spine. I plan on going to chrono it at the bow shop to find out exactly how fast it is but I remember around 280 fps. I also plan on getting an actual arrow weight while I am there. When I shoot, especially with a lighted nock at long distance, it appears the tail is slightly corkscrewing. It appears the nock is traveling in about an 1"-2" diameter circle. When I say long distance I mean 60 yards and not 100. I did spin test all my broad heads and it happens with every arrow and not just one or two. Now I am thinking of changing arrows to Easton Axis or FMJ. Reading the Easton chart on arrow spine I am right on the cusp of 340 and 300 spine. I am going to increase arrow length a bit to use the Exodus head which would push me more towards the 300 spine. So now the question: Do you think if I go to a 300 spine and increase the head to 125 grains I will get rid of the corkscrew or should I just leave it alone? When I shoot my broad heads at 60 yards I am still getting about 1/2-2/3 of the arrow penetrating the target before it stops.