Nato 7.62 in a .308

This is a discussion on Nato 7.62 in a .308 within the General Firearm Discussion forums, part of the Related Topics category; Anybody have any thoughts about shooting 7.62 Nato in a civilian 308? I have a Remington .223 that won't chamber some 5.56. Another concern is ...

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Thread: Nato 7.62 in a .308

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    Senior Member Array boatail's Avatar
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    Nato 7.62 in a .308

    Anybody have any thoughts about shooting 7.62 Nato in a civilian 308? I have a Remington .223 that won't chamber some 5.56. Another concern is chamber pressures. I understand that the Nato stuff is higher due to the miriad weapons it's used in ( full auto, etc.) I'd like to shoot some Lake City ammo for range work since it's cheaper, but I don't want to damage my old model 70 Win. carbine.
    Any help is appreciated!
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    This question pops up every 2-3 months.

    It may seem odd, but the military 7.62 x 51 round is loaded to a lower pressure than the civilian .308 Win round. 7.62x51 NATO ammo has a max pressure of 49,700 psi (usually rounded to 50,000), whereas SAAMI max pressure for the 308 Winchester is 62,000 psi.

    You're safe using NATO 7.62 ammo in a .308-chambered gun.

    Re the 5.56 vs. 223, the chamber dimensions are slightly different and the 5.56 is loaded to a slightly higher pressure, but not enough to make any practical difference. Loading .223 ammo in a 5.56 chamber is fine, but the reverse is not universally true.
    5.56 VS .223 Ammunition and Chamber Dimensions - AR15 Armory.com

    Military ammo typically has harder primers to withstand light firing pin hits when a round is chambered (i.e., to prevent slam-fires).
    Smitty
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    Senior Member Array boatail's Avatar
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    Thanks to both of you! Great info, and I should have done a search..
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    Quote Originally Posted by gasmitty View Post
    This question pops up every 2-3 months.

    It may seem odd, but the military 7.62 x 51 round is loaded to a lower pressure than the civilian .308 Win round. 7.62x51 NATO ammo has a max pressure of 49,700 psi (usually rounded to 50,000), whereas SAAMI max pressure for the 308 Winchester is 62,000 psi.

    You're safe using NATO 7.62 ammo in a .308-chambered gun.

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    Military ammo typically has harder primers to withstand light firing pin hits when a round is chambered (i.e., to prevent slam-fires).
    CORRECT

    Also, the cases are diff & so is the "go/no go ( head space.) No prob. if used in a .gun "chambered" for .308 Wn, but is if using .308 Win in a Mil. Spec 7.62 NATO gun = ????

    BTW, If you have a GOOD source for 7.62 NATO LC =

    I Shoot a M-14, & my SOCOM16 & both are set up Mil. Spec. 7.62 NATO & LC & Aussy are Great ( so is Brit if you can get it )

    Puffer

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    Senior Member Array boatail's Avatar
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    Quote Originally Posted by puffer View Post
    CORRECT

    Also, the cases are diff & so is the "go/no go ( head space.) No prob. if used in a .gun "chambered" for .308 Wn, but is if using .308 Win in a Mil. Spec 7.62 NATO gun = ????

    BTW, If you have a GOOD source for 7.62 NATO LC =

    I Shoot a M-14, & my SOCOM16 & both are set up Mil. Spec. 7.62 NATO & LC & Aussy are Great ( so is Brit if you can get it )

    Puffer
    Thanks Puffer, It is a .308 win. model 70. You also touched on my next concern, which was headspacing. Correct me if I'm wrong, but isn't it on the case shoulder? If it's as some have stated, that the chambers are different, won't that be a big problem?
    Light travels faster than sound...thats why some people appear bright before they speak

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