Spine and GPI have nothing to do with each other and you will find a few manufacturers offering a certain spine with different GPI options, some guys will stuff with GPI using inserts etc. Arrows are funny bloody things and theres no hard and fast rules. I bare shaft tuned my recurve and with a 28" draw, 30" arrow shaft and 50lb recurve I should be sitting at around 400 spine but ended up running 340 spine easton Trad Carbons, seems wrong for the bow and setup, but it works!
Must blow the dust off it actually and get shooting again!
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