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Join Date: Oct 1999
Location: 3D, Luzerne County
The M1 Garand operating system was designed around a certain gas pressure. Going above that gas pressure "can" damage the operating rod. This is why manuals like Hornady have a M1 Garand section with reloading data based on this.
Now, some people claim they can shoot regular hunting ammo through their M1 Garand without any issues. Regular hunting ammo, especially the newer stuff has higher gas pressures. You can get an adjustable gas plug for the M1 Garand which allows you to "bleed off" this higher gas pressure.
I have an M1 Garand, but I keep my loads within the recommended range. I have a FMJ load using IMR-4895 and 150gr or 168gr projectiles. I also worked up a hunting load (if they ever approve semi-auto) using 150gr soft point projectiles.
Several ammo makers make M1 Garand ammo that falls within the specs.
I see no reason to push things with my rifle. Why run the risk of damaging the rifle by shooting something outside the specs of the rifle?