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The M1 was designed to run on a 150 +/- grain bullet running around 2900fps.
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The GI spec on 150gr ball ammo is
2750fps +/- 40fps. NOT 2900fps!
It also functions pretty well with GI spec 172gr match ammo @ 2640fps +/-...
It is designed to run on IMR single base powders in a fairly narrow pressure curve. Medium burning rate powers are fine. Slow powders can create a much higher gas port pressure. This causes the action to work more violently than intended, and damage can result. Bent op rods are the most common thing to go wrong, but not the only thing.
Commercial sporting ammo is loaded to the 2900+fps range (150gr), and is hotter than the GI spec ammo the Garand is intended for.
And, just FYI, when we say "bent op rod" we meant slightly bent out of spec. It seldom has any effect on the function of the Garand, but it does have an effect on the accuracy of the rifle. And not for the better.....
as to the idiocy that is the current NY law, I cannot and will not comment further...