To measure concentricity requires the brass to be uniform otherwise you may be measuring the brass thickness inconsistency. Recall FGGM, HDY and REM match brass requires more neck turning than Lapua. Lee Collet makes the inside consistent, bushing outside consistent.
In the end realize my shooting ability impacted the POI way more than .001" runout.
In the end realize my shooting ability impacted the POI way more than .001" runout.
I don't neck turn. Still on the fence about whether it's worth it to me. I use fully processed hornady match brass at the moment. I use a hornady concentricity gauge to measure runout of completed rounds. I am far from an expert but enjoy reloading and the information and tools involved.


















































