I apologize for not being more clear and I see where I could have been. You're correct. The brass has been fire formed and resized. The point I'm measuring is just above the neck of the case, say, 1/8" above, and not at the ogive.Is brass of concern new or fire formed for your measure?
What point on seated bullets are you measuring 'bullet runout'?
\When you say: The case neck thickness varies from .005-.0015, what do you really mean? The necks are not 1.5-5thou thick, and 5thou of variance is worse than I have ever seen.
When talking about the necks of the cases, I'm not talking about how thick they are but the varience within the thickness.
I was reading about concentricity somewhere the other day and there was a comment saying that match ammo tends to have no better than .003" of runout. The commenter didn't specify what manufacturer or caliber. Personally, I bought some Hornady 6/5 match before I aquired the components to start loading for this gun. Yet I didn't think to check what their runout was on those 3 boxes. I wish I would have just for a good comparison. Maybe I'll take my Sinclair run out gauge to the gun store and see how many I can measure before they tell me to leave!Using Redding dies, both sizing and seating, for my 6.5 PRC, and using Hornady brass, I end up with a little over a thousandth of an inch in run-out. I use their Big Boss II press and their shellholder. I employ K&M neck turning tools which includes the expand mandrel.
I would like to think that my success with concentricity is a result of my superior reloading skills, but it's really the result of superior tools.
Worst case scenario: .0045" run-out is still quite acceptable.