I can buy into around .001" on that setup but I don't believe you could accurately claim less than .0005" runout with that rig even if you had a .0001" indicator. I seriously doubt the brass itself runs that perfect.
Matt
I would say you're right. I use Wilson neck sizing and seating dies, and have gotten down around .0010 to .0015 on a few, with most being closer to .0025-.0030. If you sorted out a few pieces and worked from there you could do better, I suppose. I actually think neck concentricity is way more important than cartridge concentricity (within reason). I turned the necks on my Winchester brass. But with the primer pocket issues I was having, I abandoned ship on that and went with the Hornady. Accuracy is just as good, if not better, and I didn't bother turning necks on it. If I were to rebarrel I would probably turn necks again. But that doesn't necessarily mean you will have better overall concentricity.
Oh, and, I'd say you're right about your .0004 expert. The Internet can not be bothered with substantiating claims. But I like it when people say stuff like that. It clues me into who is spewing BS so I know not to listen to them.
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