ok thats great ,,,,maybe just start with something middle of the road,, and forgiving,,something that might work at at say 28 to 30 inches of draw,, since you dont know the cast of your bow,, it might prefer a lighter spine or heavier spine, lots of variables,, I know what works in a wide range of bows for me,, if you gonna draw to 30 then cut them 31 to back of field tip,,50 55 spine,, should work ,, if you think you gonna draw to 32,, then go 55 60,,, you can always go up in tip wieght if they shoot too stiff,,
that should give you a good starting point,, to work from,, cedar , sitka spruce,, and douglas fur are all nice,,
heavier, maple and birch are my favorite,, and hickory if I can get it,, but just start with the cheapest till you know exactly what the bow likes,,,,you bow is long, ,, so you can adjust the brace to make a reasonable spine arrow shoot,,
as your release gets better you can shoot a wider range of spine all the same,, so when you first start,, dont blame the bow if you not getting good arrow flight,, it will be your release and the arrow that need tuning,, maybe where the arrow passes could go a bit more narrow,, if the arrow is hard to tune,,
ok just to clarify,, the spine arrowthe bow will like will be effected by how hard the bow is shooting,, not the draw weight,, if the bow is shooting 150 fps,, it will like a lighter spine,, if its shooting 160 fps heavier 170 fps a little heavier,, so there is a wide range there to guess what spine the bow gonna like,, so its not like you can say well its pulling 50# so it will like 50# spine arrows, so I am guessing the cast of the bow based on the profile and draw weight,, also the spine of the arrow is effected by how long the arrow is cut,, so thats what I am basing my guess on,, when you saw me shoot on utube,, those arrows were 70# spine out of a 50ish bow, they were longer so forgiving,, and my release was smooth,, I didnt have to go down to a 45# spine arrow to get arrow flight ,,, your longer draw is gonna like a heavier spine arrow,,
a heaver mass weight arrow will reduce hand shock on a longer bow as well,, and be a bit more forgiving,,the guy making your arrows does not know the cast of your bow,,so he would be guessing ,,,, if he knows about self bows,, then maybe a good guess,, if you shot it through a chrono,, it would be easier to guess, ,but once you get the first set of arrows,,,,, that will be your starting point to fine tune what works best,,cutting them shorter or heavier or lighter weight up front, and next time you will adjust spine weight when you get used to the bow,, or you might just get it perfect on the first arrows we hope,,
