I turn necks if they fall into two categories:
1. Too thick to chamber. -I turn the entire lot to a consistent thickness.
2. Wall thickness varies more than 0.002". -I turn the entire lot to the thinnest dimension encountered on any single case in the lot (unless it's an extreme outlier).
Either would generally result in a thickness of 0.014-0.015" with my .243-based 6mm wildcat, for example. That leaves me with 0.002-0.003" clearance in the chamber. That's more than many competition shooters seem to believe is ideal, but it works for me and my rifle.
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Don't even try it. It's even worse than the internet would lead you to believe.
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