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7.62MM NM Garand Ammunition Question

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    7.62MM NM Garand Ammunition Question

    Hey guys, I’m new here and have a quick question I need to ask, can I shoot standard .308 through this rifle? The barrel is marked 7.62, but I’ve seen multiple videos of people with similar rifles shooting .308 out of theirs. I’m just worried that shooting .308 through it might damage or even break the rifle, I know 7.62x51 and .308 are similar but I’m not sure if it’s safe. This is my first Garand so I don’t know much about the action of the rifle or what it can stand up to pressure wise. Any additional information would also be much appreciated, thanks.

    #2
    I think it depends on the headspace. Some barrels with 7.62 head spacing pass the 7.62 NATO GO gauge around where it's a NOGO for 308, though still within Field Gauge headspace. 7.62 will still be OK in barrels which do not pass the 308 Field Gauge, and in those I would not shoot 308.

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      #3
      In my opinion, and I don't think that it is very much opinion only, the 7.62 NATO chamber is for field reliability in war time. Every piece of loaded 7.62 NATO ammumition I have ever measured, measures, to the datum point, exactly the same as a loaded .308 Winchester round. Clint McKee of Fulton Armory had the same experience.

      https://www.fulton-armory.com/faqs/M14-FAQs/308.htm

      Danny

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        #4
        The real difference is in the chambering. The external dimensions of the ammo are, for all practical purposes, identical. A loose 7.62x51mm. chamber can allow brass to expand to where it can BARELY be re-sized. Usually, G.I. brass ( U.S. or other NATO countries ) is thicker and softer in the case body, neck annealed, etc., etc. Not all .308 is. The "danger" is pretty much non-existent albeit with some machine guns, there is a possibility of over expansion, HK21 being a prime example.

        I've also found some G.I. match barrels are effectively chambered by 'smiths to what really is the tighter commercial/civilian dimensions.

        If you're a shooter, you should know: Civilian barrels are generally better performers, and long term, with a precision rifle, the tighter chamber is much preferable.

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