Here is what I have so far bare shafting out of my 62" longbow, 60#'s @ 30", cut to center, skinny string.
If ICS Bowhunter 400's and I want to shoot my 235 grn tip its a shaft cut to 30.25 inches for a total of 526-530grns. Perfect flight both bare shaft and fletched. [20grn insert, 235grn tip, 6.4grn footing, 10grns 5" 3 fletch)
If ICS Bowhunter 340's, right now I am at 31.50" long but with a 260grn tip for a total of 630grns. Perfect flight both. [50grn insert, 260grn tip, 6.4grn footing, 10grn 5" 3 fletch]
1) I don't want a 630 grn hunting arrow. So I next need to find the correct shaft length for my 235grn tips. Or build out my window a little, or both.
For those interested, these are my experiences finding the right combo using ICS Bowhunter shafts.
I have seen lots of weird results using carbon shafts- showing false weak or stiff. You need to figure out a way to confirm if its a true reading for a given length/weight combo before you decide to accept what you are seeing. I found it very easy to think a too stiff shaft was really a little weak or perfect just by following the bare shafting guide, thinking well, the arrows are grouping right and low etc... Accept that as truth via confirmation, by shooting a heavier or lighter tip.
Stay tuned.;0)
Joshua
Edit: Today I tested again and to use my 235 grn tip it cames out to a 32-3/8ths shaft for about a 622 grn hunting arrow. I also changed my side plate out a small amount. This combo may change slightly, but this is very close to perfect. To bring it down to 600, the weight I am hung up on... ;0) I need to do some more work
Here is the break down: nocks-9.8, footings-6.4, BH w/adapter-235, insert-50, feathers-10, shaft-311 (32.25 x 9.3)
Hope this helps someone.