This was asked by a guy on another forum
1. In the never ending quest for the ultimate in long range archery accuracy, all other things being equal, which is more critical, arrow straightness or uniformity of weight?
It would seem to me that varying weights would produce vertical “stringing” on the target (related to time-of-flight/velocity variations) while shafts with straightness issues (say .006” total indicated run out) would produce more rounded groupings.
2. On any given bow draw weight/draw length, will shafts of a slightly stiffer spine produce better groups than shafts of a slightly weaker spine or will the opposite be true?
Of course, answers submitted will require apt justification for given opinions!
and here is one of the answers
Straighter Arrows Shoot Straighter, Right?
From a pure physics standpoint, yes! Arrow straightness certainly does matter. Straighter arrows undeniably fly more accurately. In long-range laboratory conditions with a mechanical shooting machine, the straightest arrows with the best spine consistencies will always group best. But try to keep this issue in reasonable perspective. You are not a mechanical shooting machine. You don't shoot in laboratory conditions, and you probably don't shoot at extreme distances (100+ yards). The straightness difference in a ±.006" arrow and a ±.001" arrow is literally the width of a single human hair. So realistically, the ±.001" arrow probably has more to do with selling arrows than shooting arrows. The truth is, only a handful of the world's archers actually have enough shooting skill to differentiate between a very good ±.003" arrow and a "pro grade" ±.001" arrow. And within the typical bowhunting range, any difference would be practically imperceptible.
What do you think?