AR-10 build

Discussion in 'Auto & Semi-Auto Discussion' started by rmcmahanP345, Dec 7, 2012.

  1. rmcmahanP345

    rmcmahanP345 New Member

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    Question....What is the equivelant Nato round to the .308? For instance, .223 has 5.56. On a CMMG stripped lower, it is marked 7.62, so would it be 7.62X54 or 54R?
     
  2. kytowboater

    kytowboater Active Member

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  3. rmcmahanP345

    rmcmahanP345 New Member

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    How readily available is 7.62X51? Would it be better to stick with the .308 because of availability?
     
  4. kytowboater

    kytowboater Active Member

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    Get an upper chambered in 7.62x51, then you can shoot both the 7.62 and .308 rounds. Both seem plentiful.
     
  5. locutus

    locutus Well-Known Member Supporter

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    7.62X51 NATO is the standard cartridge of both M60 and M240 general purpose machine guns.
    It's also used in the M21 and M40 sniper rifles.

    There's tons of it around, but it isn't cheap.
     
    Last edited: Dec 8, 2012
  6. rjgnwdc

    rjgnwdc New Member Supporter

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    We reload, all the components you need for 7.62 Nato / .308 are available everywhere.
     
  7. FullautoUSA

    FullautoUSA Welcoming Committee/ Resident Pellet Gunner Lifetime Supporter

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    .308 and 7.62x51 are the exact same thing
     
  8. JonM

    JonM Moderator

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    they are not the same.

    308 is not safe to shoot in a 7.62nato chambered firearm. the lead on the throat in the 7.62nato is much shorter than a 308winchester chamber. longer ogived bullets you find in some off the shelf ammo can cause dangerous overpressure levels in a 7.62nato chamber.

    its the same difference as 556 and 223 except the civvy version in this caliber is the more versatile chambering.

    if you have a 7.62nato and the owners manual doesnt say it is safe to use 308winchester do NOT use ammunition off the shelf for 308winchester in it. stick with 150grain bullets or less. if you reload and want to use heavier bullets in a 7.62nato you need a chamber gage of some sort like the hornady locknload bullet comparator and chamber gage so you can find the proper lead from the ogive.
     
    Last edited: Dec 8, 2012
  9. asmith2690

    asmith2690 New Member

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    Isn't the .308 a higher pressure round than the 7.62 meaning you should buy the .308 in order to shoot both? I could be wrong but I thought I read this somewhere just making sure
     
  10. JonM

    JonM Moderator

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    Same pressure curve. 308 chambers are longer in lead than nato so some hunting off the shelf ammo can cause over pressure from the bullet ogive too far forward coming into contact with the rifling when chambered in a 762 nato gun. You can have a gunsmith cut a nato chamber to 308 spec then its not an issue
     
  11. dickpalmer

    dickpalmer New Member

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    I was concerned about this when I started with the .308s, so I called DPMS and they told me that it doesn't matter about 7.62X51 and .308. I brought up the discussion of 5.56 vs .223 and he said it's not the same with 7.62. Maybe the people at DPMS are idiots.
     
  12. locutus

    locutus Well-Known Member Supporter

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    The DPMS has a .308 chamber and can be used with either type ammo.
     
  13. dickpalmer

    dickpalmer New Member

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    I was questioning because my barrel is marked 7.62x51. Those dorks said that there's no difference.
     
  14. Txhillbilly

    Txhillbilly Active Member

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    In a DPMS it doesn't matter which you shoot,because all of their chambers are cut for a 308,so shooting 7.62x51 rounds is a gimme.
    What brand of barrel do you have?
     
  15. Ross_The_Boss13

    Ross_The_Boss13 New Member

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    Is a rock river .308 26" bull barrel to heavy I ordered one and was told later its like having a bowling ball on the end of it am I going to be wanting to cut the barrel down
     
  16. dickpalmer

    dickpalmer New Member

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    I must not have made this clear enough. DPMS told me there is no difference between 7.62X51 and .308 rounds. Not only on their firearms, but all.
     
  17. jjfuller1

    jjfuller1 New Member

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    knock knock, whos there? com. com who? common sense says if they were the same they would have the same name.

    a chevy camero, is different than a chevy camero ss.
     
  18. dickpalmer

    dickpalmer New Member

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    That's why I said the people at DPMS must be idiots. Dang, a broken record already.