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Thread: .308 Winchester vs. 7.62x51 mm pressure

  1. #1
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    .308 Winchester vs. 7.62x51 mm pressure

    I was talking to a friend today and he found some information on the errornet that stated that the commercial .308 Win ammo is loaded to higher pressures than military 7.62 x 51 mm (NATO) ammo.

    I was always under the impression that this was the reverse as proven by the generally thicker base of the military cases. Can anyone point me to a difinitive reference on this (one way or another)? TIA.
    Last edited by CarlosDJackal; 01-01-11 at 21:30.
    We must not believe the Evil One when he tells us that there is nothing we can do in the face of violence, injustice and sin. - Pope Francis I

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    I had heard this too before, but I can't remember where. With a quick search, I found the following website. I don't know that it could be termed 'definitive' or not, but until someone tells me this site is often erroneous I will continue to find it useful.

    http://www.6mmbr.com/308win.html

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    7.62 NATO is lower pressure than .308 Winchester.
    I'm an FFL/gunsmith, not the holster company.

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    The SAMMI/CIP maximum pressure for the .308 Win cartridge is 62,000 psi, while the 7.62x51 max is 50,000 psi

    http://www.6mmbr.com/308win.html

    See it has already been posted by PlatoCATM
    Last edited by Thomas M-4; 01-02-11 at 00:31.

  5. #5
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    That's interesting because I remember another website that states the opposite max pressure. I'll have to keep digging.
    We must not believe the Evil One when he tells us that there is nothing we can do in the face of violence, injustice and sin. - Pope Francis I

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    .308 is higher pressure than 7.62N. I dont have the link to back it up but ive looked it up before.

    SAAMI and MIL pressures are measured in different places IIRC so thats why you may see some literature list 7.62N as higher pressure.
    I have no ambition in this world but one, and that is to be a fireman. The position may, in the eyes of some, appear to be a lowly one; but we who know the work which the fireman has to do believe that his is a noble calling. Our proudest moment is to save lives. ~Edward F. Croker

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    7.62 NATO and 308 Win have about the same maximun chamber pressure. You cannot directly compare the way CIP measures pressure to SAAMI to NATO, so the often cited differences are apples to oranges. I have written to many ammunition companies and even makers of pressure testing equipment to confirm this.

    You do have to be careful about the pressure curve, the 7.62 N normally uses relatively fast powders and the gas port pressure so the gas port pressure is kept at bay. Some 308 can be loaded with slow powders (specially the "light magnum" kind of loads), and thus the port pressure can be vastly different with functional/durability problems in some guns.

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