Arrow spine ?

[Pine]

Well I am not really asking a question , just some facts about my setups .
The puzzle is that my 50# Super Griz shoots a 70-75# 29" arrow . My 45# K-Mag shoots the same arrow .
My 55# Dwyer Dauntless longbow shoots a 60-65# 29" arrow .
My 45# Bear Takedown shoots a 65-70# 29" arrow . The same bow with 60# limbs shoots a 105# 29" arrow .
And I have tuned these bows by bare shafting , so I guess what I am getting at is , how can a person tell another what arrow should work just by the specks of the bow ?

[Bud B.]

I have found, with woods, that it's a crap shoot for each archer. What I mean by that is, each of us shoots differently, with differing release smoothness. What works for me might not work for another of same DL shooting the same bow and same arrows. We can get each other in the ballpark with what works well for us when telling another of recommendations, but a test kit, in the length arrow and point weight you want to shoot, is the best thing an archer can have in his or her tool kit. Then, simple tweaking can get YOU where YOU need to be.