A few weeks back someone posted a case that had been run through a fluted chamber. Someone mentioned that resizing would iron out the fluting marks. Today I gave that theory a
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Fluting (firearms) - Wikipedia
What effect does a fluted barrel have on a rifle? - Quora
Bren 30-06 barrel with fluted chamber
Beware of Commercial .308 and Fluted Chambers -The Firearm Blog