OMG an archery related thread! 
So I'm trying to use my old arrows with a new bow and I suspect spine is too weak so I'd like to work up the perfect selection if I'm gonna buy new arrows.
Many years ago I used a software I bought that calculated it all out and in addition it had an actual spine deflection database that listed for example brand X 340's were really around 355 and brand Y 340's were more like 320. Of course if the software calculated that I needed a 330 that would effect my arrow choice. I can't seem to figure out what software I used and it probably doesn't exist anymore anyway but looking for it ran across the Archer's Advantage website.
I figured I'd ask and see if anybody here knows how well it works before I throw any money at it and see how well it works or of there's any better options I should look for.

So I'm trying to use my old arrows with a new bow and I suspect spine is too weak so I'd like to work up the perfect selection if I'm gonna buy new arrows.
Many years ago I used a software I bought that calculated it all out and in addition it had an actual spine deflection database that listed for example brand X 340's were really around 355 and brand Y 340's were more like 320. Of course if the software calculated that I needed a 330 that would effect my arrow choice. I can't seem to figure out what software I used and it probably doesn't exist anymore anyway but looking for it ran across the Archer's Advantage website.
I figured I'd ask and see if anybody here knows how well it works before I throw any money at it and see how well it works or of there's any better options I should look for.
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