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The M14/M1A fired brass NEEDS to be FULL LENGTH re-sized. The shoulder needs to be pushed back to within spec.

What MFD and RAMAC said above is true. The brass gets stretched because the action is yanking the brass out of the chamber while the brass is still expanded from the shot.

Download this, then read it. It is considered the bible for reloading practices for the M1A and the M1 Garand.

 
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