Help with arrow spine.
So I'm having problems finding the correct spine to shoot. When I look on different manufactures websites they are telling me to shoot 400's with my set up but when I use archers advantage it is telling me that 400's are slightly weak but 340's are marginally stiff. I guess I should probably buy a couple arrows of both spine and shoot the one that groups the best but I thought I'd ask here first before spending the money. Specs are listed below. Anyone else have these problems when trying to find a correct spine?
IBO 325. Pulling 60-64 pounds. 29" draw and arrows cut to 28". 100 grain points/broadheads.
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