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Been many years since I've owned a Garand but IIRC you can use any commercial load with a 150 gr bullet as long as the charge is a single base powder. Probably some that use double base powders, but best to stick with single base in order to maintain the proper burn rate and gas port pressure.
I'm pretty sure that all WW2 .30 M2 Ball used single base powders.
Cracked or broken out receiver heels were a problem in early testing. They solved this by annealing the heel in molten lead.
Not sure but I suspect use of M1 Ball with its heavier bullet or other .30-06 ammo loaded with a double base powder caused the breakages and led to use of 150 gr bullet and single base powder only for ammo to be used with the Garand.
Increased erosion of bore (aprox 10%) and gas port by the Double base propellents available at the time were other factors to consider.
Besides possible damage to the receiver heel the rear of the bolt may be peened causing the firing pin to lock up and/or the leg of the pin may be damaged.
Five round and three round enbloc clips have been manufactured for the Garand.
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