[Clifford L. Hughes]

Dear Deepcore:

One area that you might check out is chamber pressuer. Are you loading light loads or full power loads? Light loads will push back the shoulder. The reson being is that when the primer fires it pushes the case's shoulder against the chamber's shoulder thus shortening the case. When the powder ignites with a full power load the case is reformed to the chamber dimensions. Low power loads might not have enough pressure to reform the case resulting in a pushed back shoulder. Often, in extremely low power loads the protruding primers are mistaken for over loads.


Semper Fi.

Gunnery Sergeant
Clifford L. Hughes
USMC Retired