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Old February 25, 2013, 06:47 PM   #2
James K
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Join Date: March 17, 1999
Posts: 24,383
Yes, there is. The M1 (the "Garand", in case anyone is confused) has a fixed port size and does not have a gas cutoff and expansion system like the M14. It was designed to function within fairly narrow limits of pressure and bullet weight, as well as a limited range of powders. For reliable feeding, the COAL (cartridge overall length) and bullet shape should conform to GI specs.

While many owners have used reloads outside those ranges and claim they have had no problems, it is best to stay close to the specifications of the GI M1 Ball and M2 Ball cartridges. That would mean a 150-165 grain pointed bullet with about 46 grains of a powder like 4895 for a muzzle velocity of around 2650 fps. Understand, these figures are approximate and you should consult a loading manual for specific data.

Jim
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