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Thread: .308 difference

  1. #11
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    5.56mm NATO (5.56x45mm) is the ammunition designed for the M16 select fire rifle. It is loaded to slightly higher pressure than the .223 Remington (SAAMI version) of ammunition. However, CIP specs the same proof load pressure for both cartridges.

    The specifications of the case dimensions are practically identical. The chamber dimensions, however are specified differently, which is done because reliable feeding is very important in military rifles... much more important than accuracy. Leade length (the amount of barrel length near the chamber before you hit the rifling) is the major difference. The tighter chamber specs of the .223 Rem chamber can be more accurate for target and varmint rifles.

    The 7.62 NATO (7.62x51mm) and the .308 Winchester have similar military/civilian application history (the M14 rifle designed to fire the new shorter round than the old .30-06 with the 150gr bullet to the same velocity as the M1 Garand). The jury is out on whether the rounds are actually loaded to different pressures (some say the .308 is loaded to higher pressure, but this may just be the difference between the PSI and CUP standards of measurement). However military brass is thicker then .308 brass and care must be taken in reloading military brass to avoid over-pressure.

    The .308 Winchester is a much more powerful round than the .223 Remington. The .308 will fire a 150gr bullet at 2700-2800fps and the .223 will fire a 55gr bullet at 3100-3300fps.
    Last edited by kludge; 12-07-2011 at 15:53.
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  2. #12
    Grandmaster sloughfoot's Avatar
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    I was talking to a fellow today who thought the 7.62X39 was THE 308. He was not aware that the 308 Winchester is a totally different cartridge.

    OP was that you?

    Kludge did well by posting pics and an excellent explanation.
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  3. #13
    Grandmaster U.S. Patriot's Avatar
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    The 5.56 is loaded to a slightly higher pressure compared to .223. The throating is slightly different on the 5.56 case as well. However, .223 gives you a lot more choices if you buy factory loaded ammo. If you reload, you can use .223 or 5.56 cases to load either, I do. Also, 5.56x45 is the NATO designation. To the original poster. Go to an online retailer like MidwayUSA. You can look up and compare the stats on .223 compared to .308, IE: muzzle velocity, etc. Also, the .223 is .22 caliber bullet, where as the .308 is a .30 bullet.

  4. #14
    Not afraid of the dark! Icarry2's Avatar
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    @chrstian_indy - Another consideration is that a .223/5.56 round is cheaper, lighter and you can carry more then .308/7.62x51 rounds.

    If your considering an AR platform there are major differences between an AR10 and AR15 platform, cost, mag cost, mag compatability, upper and lower compatability, etc....

    An AK47 uses a 7.62x39 round.. (same bullet as the .308/7.62x51 round but has a shorter case.. Sort of an inbetween round..

    If your new to rifles and shooting I think someone suggested a Ruger 10/22 and a couple thousand rounds of practice that is valuable.

    It is hard to learn to shoot a big rifle, practice, practice, practice and for that a 22 is the cheapest there is...

    Just my pennies..
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  5. #15
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    Quote Originally Posted by kludge View Post



    The .308 Winchester is a much more powerful round than the .223 Remington. The .308 will fire a 150gr bullet at 2700-2800fps and the .223 will fire a 55gr bullet at 3100-3300fps.
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  6. #16
    Grandmaster jeremy's Avatar
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    Quote Originally Posted by Mgderf View Post
    ".308, Because people like to hide behind things..."
    Greeen tip helps the 5.56 with this problem as well...

  7. #17
    Master iChokePeople's Avatar
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    7.62, 5.56. Meh. Gunner, sabot, tank!

    120mm smoothbore: when you care enough to send the very best.
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  8. #18
    Grandmaster jeremy's Avatar
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    Quote Originally Posted by iChokePeople View Post
    7.62, 5.56. Meh. Gunner, sabot, tank!

    120mm smoothbore: when you care enough to send the very best.
    Huh...

    I must have been in the Flowers, Rainbows, and Unicorn Farts part of the Army then...
    Steel Rain...
    Nothing quite like smashing a square kilometer to tell someone to leave you alone...

  9. #19
    Master iChokePeople's Avatar
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    Quote Originally Posted by jeremy View Post
    Huh...

    I must have been in the Flowers, Rainbows, and Unicorn Farts part of the Army then...
    Steel Rain...
    Nothing quite like smashing a square kilometer to tell someone to leave you alone...
    I will have to concede that DPICM makes me happy.
    Quote Originally Posted by JetGirl View Post
    But I will cut a ho.

  10. #20
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    Quote Originally Posted by iChokePeople View Post
    I will have to concede that DPICM makes me happy.
    I can see why... Nice.

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