You will probably have to try different shaft combo's to get the one that works. The easiest way I've figured would be to put all the shaft combo,s together (slip fit) to check on a spine tester and rate from weakest to stiffest. Pick your broadhead/point weight.(300 gr?) Pick a combo in the middle, make up a fletched and an unfletched arrow and see where you are in spine. Once you find one close tune like any other shafts. Most of the aluminum combos will give you a 600 to 700 raw shaft weight, add point,nock,fletch,cap/wrap,crest and you should make weight pretty easy.