Something else to consider here, cutting down the barrel length of the Garand to make a "tanker or carbine" style removed power of the cartridge. It needs at least 24 inches of barrel to make use of the powder in the round. To cut it down to 18 inches like the M1 .30 Carbine would be a waste of powder.

BTW, the .30 Carbine round makes an excellent round in a Ruger Blackhawk wheel gun, a friend of mine has one, and the ballistics are amazing. Nearly as good as my .357 magnum in the same revolver actually.

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Happy Trails,
Clint.