Hiya Hicklife,
what shelf setup do you have on the #60 bow- , i'm sure you are aware- but if its a shoot of the knuckle- you will need spines lower than #60 and if it were the other extreme and was cut past center- you would be needing spines higher than #60- this is just a quick generalization- so many other factors here- draw length , arrow length intended point weight, intended fletching sizes etc etc.
i have built many arrows from dowels- and they work just fine- IF- as said above- you are judicious in your selection of them.
one small point i will disagree on though- is that a good shaft maker- will take into account the many variable factors that discern between an arrow shaft and a dowel.
specie, raw wood selection, grain configuration, free of knots, twist or rot, and most importantly in my opinion- is the fact whether the wood has been kiln dried or not. kiln drying- when done with more concern for speed and production, will do irreversible damage to the wood on a cellular level- rendering it quite inferior for shafts.
The fact is- man has been shooting bows, for many millennia prior to the advent of nicely turned shafts from a shaft maker.
In fact his very survival has depended on a variety of species and shoot types for arrows- and obviously they worked, or we wouldnt be around, i guess
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i love shooting shoots- they do take a heck of a lot more work, but in turn are extremely rewarding.
Hicklife, i would suggest you ascertain your spine requirement as a start- even if that means putting together, or acquiring a bit of a test pack of arrows.
then if you are set on the dowels- you can make a very easy setup that you can take to the store with you in order to match your shafts.
you dont need a proper spine tester as you are not measuring a variety of shafts- you are just trying to match shafts.
now if i can just figure out how to post pics here- i have a sketch here for you, for an easy to tote around "spine matcher"- with any random weight you find works best- doesnt need to be 2#