Originally Posted by
LongRange
when you size a 308 case down to 264 your pushing brass down into the neck shoulder junction and thats where the doughnut is/starts...if you have a .297-.299 neck in you chamber your most likely going to end up with doughnuts if your using bushings to size your necks...bushing do not fully size the necks so it makes it even worse...and doughnuts dont iron out when fired...you say you already have a slight doughnut but it dont interfer? the only way they dont interfere is if the base of your bullet is seated above the neck/shoulder junction.
i used bushing dies for a few years and this is the reason i quit using them...if your sizing your necks more than .003 .004 from fired to ready to load then your most likely going to have doughnuts and they may only be slight but they will be there and cause inconsistent seating and high ESs.
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