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You can, but you should probably stay within a load range that comes close to GI ammo if you want to be safe. The M1's can be dangerous if you dont pay attention to what you feed them, and pressure isnt the only issue.
The M1 was designed to run on a 150 +/- grain bullet running around 2900fps. Rumor has it, youll bend the op rod or cause other damage to the gun if you wander into heavier bullets with slower burning powders. Ive shot some in mine over the years without issue, but I never fed them a steady diet of it, so I cant really say one way or the other.
Some say if you use an adjustable gas plug, it doesnt matter. I havent used one, so I cant really comment there either.
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