I chased answering the question of how much runout affects accuracy.....my results were inconclusive. Instead of answering that question, just eliminate the runout problem.
If your brass thickness is not uniform, you are chasing your tail trying to produce concentric ammo. Non uniform brass bends when you resize it.
I found that a reading body die, lee collet die, and forster bench rest seater produces <=2 thou.
Using the above dies, I don't even measure concentricity anymore because its always <=2 thou with Nosler or Norma brass.
