I recently bought a test kit from Surewood Shafts, and have them dipped crested and fletched, and finally had some ok weather to shoot a little bit. I called and talked with Steve and ordered a dozen and a half shafts starting at 40-45 spine and ending with 65-70 spine. I had the 60-65 and 65-70 spines back tapered from 11/32 to 5/16, all the rest are 11/32. I shot five different bows tonight, my two Northern Mist 51# @28" and 52# @ 28", my Black Widow recurve, 51# @ 28", Hill Country Wildcat 41# @ 29" and my JavaMan Elkheart 41# @ 28". All of them seemed to shoot the 60-65 spine the best. I fletched them with 3-5", these were the only ones I didn't notice any "kick" up, down or left, right. Just curious if anyone else has come across this, I was very surprised with the light weight bows shooting so well with the heavy spine weight. These shafts came in with a 670-680 total grain weight, which also surprised me with how well the light weight bows shot them.