From 61-71 the sizes went from 0-10 and the #8 hunting shafts were listed at 45-50, 50-55, and 55-60. From 71 on the sizes were 0-12 and the #8s were listed at 40-45.
I have some #8s and at 29 inches the spine tester says .460; they do fly like 2213s but are heavier, about 530g w 125g point.
I also have some #7s that test out at .620, and they do fly like 1916s, but again are heavier, about 515g w 125g points.