I was sitting here today thinking about accuracy. Arrow spine came to mind and draw weight effecting my spine had me thinking.

Lets say yourbow requires a 400 spine arrow set-up. You can be on the low end of that spine chart almost a480 spine arrow or you can be all the way up to the upper limit of the 400 spine just this side of a 340 spine arrow.

My question is has anybody ever complied with detailed testing to see what 1/3 margin on the chart provides the best accuracy. 1/3 being the low end of 400 spine chart, 1/3 being right in the middle of a 400 spine chart and the remaining 1/3 being in the upper end of the 400 spine chart. What one has proven to provide the best accuracy?

I can put my arrow spine where ever I want it, by adjusting draw weight or cutting small amounts of length off my arrows. Wanted to get some ideas before I proceed.