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There are mixed thoughts on a concentricity gauge, it is very useful for troubleshooting, but kind of like a board scope. It can lead you down a rabbit hole. If you are perfectly happy with a load in a particular rifle, there is no reason to get out a baroscope or a concentricity gauge.I'm not sure what that is for, could you explain? I'm just getting back into reloading and am wishing to get into the more intricate aspects. Forgive me for being some naive!
Thanks for getting back to me, no hurry, I'm on the road too!