There is a you tube video from Victory on this. They use a state of the art laser sorter. The shafts are identical except for the runout. This is done on the full length of the shaft. Which varies generally from 30" to 32". If you shoot an arrow cut to say 28" or so. You will automatically more than likely straighten it by a couple thousandth. If you cut from both ends probably definitely straighten by .002 to .003. Some of the arrows that get in the "sport" class will be better than .006, they may be .004 or .005, but they could not make the .003 "gamer class.
I usually buy the "gamer" class and cut them down. But if I wanted to save some money and wasn't all anal about it, I would get the sport and cut from both ends and roll with it.
I have used Black Eagle Outlaw, Beeman Bowhunter, And Gold tip Pierce arrows. They are all listed as .005 to .006 arrows ....Pfffft...you cut em down some, square the ends. I have never not had a broadhead spin true on them. If your just hunting and shooting casual target for fun out to 50 or so yards. They are fine.
Would I target shoot at long range with them competitively. No. Would I shoot at a Rocky mountain sheep at 80 yards with them I paid 10,000 dollars to get too.No. Could you run a 3d course out to 40 and keep em all in the vitals. yep. Would you miss a deer at 40 just because of this small arrow diff . Nope
Guys who shoot full length have to pay more attention. The shorter your arrow the better results you will see by cutting.
Some arrow companies I would not necessarily trust there runout dimensions. Victory, Black Eagle, Gold tip, Easton, pretty much, If I got one much off I would make them take it back.