Thread: Concentricity

In a good hunting rifle, 10 thou runout would not really bother me.
I used to be anal about case run out as that in turn leads to bullet runout and should be all you worry about unless you have seating issues.
But once fired thru my chamber my brass has little or no runout. Good starting point.
I only neck turn for optimal clearance if the batch of brass needs it.
I never use the button on my sizing dies as that can create all sorts of dramas.
My loaded rounds rarely have any more than half a thou run out but as Andy said I have fired some excellent groups with 3-6 thou runout at distance.

To be honest I have had more noticable results in my reloading, and gains in accuracy and ES with my backyard annealing.

If you think about it, 5 to 10 thou of runout should be corrected with some jump by the barrel anyway. Otherwise I think you would see major accuracy issues because of off skew projectiles ripping thru your barrel.

I have had perfectly concentric rounds shoot noticably worse at distance than ones with some runout. Most likely me but I at the end of the day should be the weakest link.
If you have under 5 thou runout and everything else in your control is perfect you should be confident all is well. After all, I don't think anyone is able to release a round and say that one had 5 or more thou runout😆


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