The M14/M1A has a straight operating rod, as opposed to the Garand's S-curved model. The Garand's starts bent, the wrong / higher gas pressure puts stresses on it that make it bend further in the direction it's already going.
You can shoot just about anything you can properly chamber in an M14/M1A.
You can shoot just about anything you can properly chamber in an M14/M1A.

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