...but that 1" removal will change the spine a bit.
I agree with ya Pat,
Hey guys,
When I'm making a set of arrows for a specific bow, I will make some 3-4" longer than draw length with nocks and start with 100 gr glue on point, no fletching. (Bare Shaft Tuning) Shoot them at 10 yds into some Styrofoam. So the arrow is free to move at will, some target material will "guide" the arrow and give a false indication. For a right hander....if the arrow hits the target with the nock end to the left the arrow is weak, and I cut 1" off and shoot it again and keep trimming until it hits the target straight. Then add fletching and go with a 125 gr point and that arrow will be tuned just right for that bow. Be careful, I have had some so weak in spine that the arrow broke when it hit the target. I try and start with an arrow close to the spine for the bows draw weight and make them a couple of inches longer (weaker).
If the arrow hits the target with the nock to the right it is strong and I add point weight until it hits straight, up to 200gr point. Then I think it's to much weight forward and use that arrow for a heavier bow. Changing the length 1" will effect the arrow flight much more than adding 25gr to the point IMO.
It took me many many (a couple of 100) arrows and many shots to figure it out.
Short answer.... there is no "standard" when working with natural materials, it's all in the arrow spine in relationship to the bows draw weight.
DBar