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I hope you are welcome. I know I don’t practice over 45 yards and that’s not every day. And my groups some days are way better than others at any distance. I know if I shoot regularly and practice good form my groups do improve. I’m shooting a 28″ draw at 68# on my Z7 Mag and my MR7 and I cannot shoot a 340 spine arrow very well with either. That spine is too weak and my groups open up huge at 40 yards and a fixed broadhead goes right every time. I had to use a .300 to improve my groupings and tune broad heads. I used the 5575 with my Switchback set the same pounds as the others and I found those weak for shooting it and moved up the .350 and was a improvement.
This is a link to the Gold Tip site where they tell you how to select the proper spine or model arrow for your setup. The first section under compound bows using a release aid is your answer to your question here under number 2. I copied here for others too to read. Going by this recommendation you understand some of the reason to move to a stiffer spine. “2. For compound bows with IBO speed rating between 315-350 FPS shot with a release aid, choose at least one box to the stiffer side (to the right) for your recommended arrow. Example : If your draw weight is 72 Ibs and your arrow length is 29″, select a shaft from group number five.” [/quote] You bring up something very interesting about underspined arrows throwing broadheads to the right...that is exactly what mine do. It never really occurred to me that my arrows were too flexible. Hmmm, now you got my mind all revved up trying to figure out how to slide the purchase of a dozen arrows under my wife's radar... Also, thanks for the link! Much appreciate it.
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