Honestly it depends on your load and what your accuracy expectations are.
Shooting 150gr M2 or 173gr M72 bullets with a charge of 4895 or 4064 you probably won't see much of a difference between cases.
If you can get 2 minuts with the M2 projectiles and 1 minute with the M72s, you are doing great for a Garand.
Personally I'd give it a shot, it can't shoot any worse than some milsurp ammo out there.
Jimro
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Machine guns are awesome until you have to carry one.
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