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Message: <blockquote data-quote="dok7mm" data-source="post: 2152980" data-attributes="member: 90080">Position of bullet in the neck also varies with proper seating depth, so a given position to start with may effect where your bullet ends up.I handle possible donuts by getting into the shoulder when turning new brass. I also use full dies without expander balls and follow up with a mandrel. Lucky so far!Tight dies and loose chambers really over work brass and push shoulder into neck, causing quick donuts.I always figured 35* and 40* shoulders would have fewer donuts, until I had the problem with 280a.i. donuts. Traced it down to the die being tight & factory chamber.</blockquote>