How do I select the right arrow spine?
When your trad bow can shoot a bareshaft in the same grouping as your fletched arrows then you know it’s tuned And that you have good form. What this tuning does is makes the bow quieter, more forgiving and more accurate.
in the beginning it’s best not to worry about arrow spine but instead concentrate on your form. You cannot get consistent bareshaft indications when your form is erratic. Down the road, It’s a good exercise once you do have a tuned bow/arrow combo to continue to shoot bareshafts as these will indicate form errors in a tuned set up.
The Stu Miller and 3 Rivers calculators will get you close on spine assuming dead nuts accurate data entry- you have to measure everything. Example: a 1/6” error in strike plate makes a big difference. I an guilty of not measuring accurately myself.
STU MILLER CALC HERE
Orherwise you can order one or two arrows of different spines from some suppliers, Lancaster is one. It’s best to start long and then cut the arrow down in small increments until it bare shafts perfectly. I don’t even fletch them now but instead bareshaft a test Arrow first.
Its crazy how well feathers can make a poorly tuned arrow fly well, thus bareshafting is essential. If your bow shoots a bareshaft straight, then it will shoot your broad heads to the same point as your field points. Its best to start close to the target-like 5 yds in case those arrows are way off spine. I look at where the shaft strikes the target in relation to fletched arrows and dont worry if its at a slight angle Nok R-L-up or down some of that can be target material related. . Some guys want those arrows in the target perfectly straight, more power to them. .
Bareshaft location in relation to fletched arrows is a good way to dial in your perfect nokking height. High- raise nokking point, Low is opposite.
Another option: Some guys shoot BHs with their field points and compare groups tuning that way. I do this in my compound but I think its a finer tune in a trad bow with a bare shaft.
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