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I have been reloading for 40 plus years and have gone down many rabbit holes but not this one. I have always tried to buy good equipment and dies to hopefully minimize run out on my loaded ammo, but until recently, I have not really measured it. I recently bought a sinclair concentricity guage and have found some surprises with my ammo. Some has measured quite good, .004" and under and as good as .0005". Other ammo is all over the map and as bad as .010" plus total run out. I have some new equipment and dies on order to tame my "problem children". My goal is to make my precision hunting and target ammo have .002" or less total run out. Having the tool to test where the run out is induced is the first step towards recovery. What is your experience with concentricity and accuracy, is the juice worth the squeeze? Fire away!
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