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Any time loads are reduced more than about 10% below maximum, the fired 308 case usually won't be fully expanded to fill the chamber. Case shoulder is set back a couple thousandths or more and maximum pressure ain't enough to push the back of the case against the bolt face.
Neck only resizing won't move the fired case shoulder forward. Subsequent neck only resizing soon ends up with incipient head separation cracks.
Full length resized such cases may not move the fired case shoulder forward enough.
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