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You may have to low a pressure. On firing the cartrdge is driven forward to the shoulder of the chamber, then the pressure forces the primer back slightly against the bolt, followed by the head of the cartridge being pushed back and stretching the case slightly. Lower pressure loads may not have enough pressure to stretch the case so the process stops after the primer is pushed back.
In many cases there will also be some blackening of the otside of the case neck from not sealing quickly and tightly enough to prevent some leakage.
If the loads are below the max try moving up a lttle bit.
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