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Old March 16, 2013, 05:39 AM   #30
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Join Date: July 20, 2009
Location: PA
Posts: 1,214
MJN77, your question is patly related to this discussion. Springfield recommends using only milsurp 7.62x51, but that is only due to the design of the rifle and the usual components of military ammo. The M1A has an inertial firing-pin and the manufacturer doesn't want to get sued if the softer, more sensitive primer of a commercial round goes off when the round is chambered. Military ammo can have thicker primer cups to better withstand MG use. You find the same firing-pin design in AKs, ARs, SKSs, but only the SKS seems to share the same concern.
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