The variation in case weight is by definition a difference in the amount of brass. That variation can manifest itself in the case not being concentric, the neck not concentric to the body, etc. Is the variation large? No, but it helps remove fliers and yes, there are more than a few, non-benchrest shooters that weigh and sort their bullets too.
Rich
ETA: Fun article to read on brass prep: 6mmBR: Case Prep
Rich
ETA: Fun article to read on brass prep: 6mmBR: Case Prep

Comment