Good points, all
The problem in using factory ammo in an M1 Garand is what we do not know what powder was used to load it. Powders such as IMR4895 and IMR4064 are just fine with sensible loads. Factory ammo may have IMR4350 or IMR4831-type powders and therein lies the problem. I would shoot military ball ammo or reloads.
Just a comment regarding the CETME. I have one and shoot it with reloads. The extraction is violent and commercial brass has worked just fine with moderate loads. All the best...
Gil
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