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Can You Shoot 7.62 Out of a 308

Written By Tuesday, February 15, 2022 Add Comment Edit
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  1. Started a thread found out info on .308 only wondering can it be fired in a vii.62x51 and vise virsa?

    Thanks guys for the assist

  2. A rifle chambered in .308 tin can shoot both, merely one in 7.62x51 can't shoot .308.
  3. .308 winchester generally fires with more than pressure level than vii.62 10 51 NATO. I wouldn't advise shooting .308 and a burglarize chambered in the NATO circular, however some guns can handle the higher pressures.
  4. Like the 2 guys before me have already said...

    A gun chambered for .308 Winchester tin generally handle both.

    A gun chambered for NATO standard vii.62x51 can't be guaranteed to safely shoot both, considering commerical .308 Winchester cartridges may take produce higher peak pressures.

    In that location are people on THR who will say that you really shouldn't worry about it. Some of united states (myself included) accept fired commercial .308 Win in rifles built for 7.62 NATO. I practice information technology in my Ishapore 2A bolt action and have had no problems so far. That doesn't mean information technology's safe or recommended. It just means that it works, and at least with MY rifle, information technology hasn't caused a catastrophic failure.

    I'm going to go out on a limb and say that the real problem with shooting .308 Winchester in a rifle chambered for 7.62 NATO is more related to increased wear and tear on the rifle rather than the risk of catastrophic failure. Y'all may notice more than accelerated habiliment in a semiautomatic battle rifle (since its operation depends on recoil energy generated past the ammunition) than you would with a bolt action military burglarize like the Ishapore 2A (which is basically a Lee-Enfield No1MkIII made with more modern steel and chambered for seven.62 NATO).

  5. I take shot them both from both chamberings with no big "KABOOM"! Ihave as well never personally known anyone that has had whatsoever mishaps interchanging the two rounds. I take shot several thousands of rounds. Be your own judge and ever know the condition of the rifle you are shooting. I only shoot this round from bolt action rifles, so I tin can't speak for semi auto rifles.
  6. "A rifle chambered in .308 can shoot both, but one in 7.62x51 can't shoot .308."

    Boy, then I approximate I do the incommunicable every weekend!!!
    This question gets asked Mode too often and the same spurious cyberspace info gets repeated. The 2 rounds are essentially the same, and merely RARELY will non interchange, usually armed services 7.62x51 not plumbing fixtures into a tight commercial chamber.
    Reloading is the problem, equally hot .308 loads can be dangerous in military machine 7.62 contumely, as it has thicker web contumely and less internal capacity.

  7. I judge maxim that y'all tin can't burn down .308 in a 7.62 is wrong, but every bit a general dominion you shouldn't fire 7.62 in a .308.
  8. Not exactly. I remember he was referring to the fact that although they have nearly identical outer dimensions, 7.62 NATO brass is thicker than .308 Winchester brass. That ways that the NATO standard contumely has a lower internal capacity than commercial brass. That's why hot .308 Winchester loads can produce college pressures.

    He is specifically cautioning against making hot handloads using 7.62 NATO contumely.

  9. goon

    goon Member

    Joined:
    Jan 20, 2003
    Messages:
    vii,265
    I generally also interchange the two. Sort of.
    The burglarize I shoot the nigh 7.62x51 in is a DSA STG-58. They were built on new DSA US made recievers but with Austrian STG parts. The barrels would have been chambered for vii.62x51mm, not .308. But the reciever is marked for .308 Winchester. I called DSA once and they told me that they practise their testing with Portugese surplus (unless they ran out past at present), which over again, would have been 7.62x51. And then for all intents and purposes, I don't worry about it much with this rifle.
    Only...
    - My .308 handloads are e'er on the moderate side to keep them around the same specs as military surplus ammo. I do this and then I don't take to adjust my sights or gas setting when switching betwixt milsurp ammo and handloads.
    - Whatever manufacturing plant .308 I shoot will also exist around the same weight as military surplus ammo. I tend to stick with bullets ranging from 147 to 168 grains. I could probably go upwards to 180 in my FAL and but take out the extra pressure level by adjusting the gas, but in my position, I have no reason to bother with that. And I'd never even attempt to put something like a Calorie-free Magnum in my FAL.
    - I've also been shooting some Black Hills Match ammo lately loaded with 155 grain Hornady A-Max bullets. I like this load because I establish some at a reasonable price and because it sort of replicates Hornady TAP just saves me virtually $10 a box. I effigy this ammo was originally intended for use in something like an M1A, and so it's OK in my FAL. And that has proven to be the example.
    - I have had trouble with hard chambering of some 7.62x51 in some .308 chambered rifles but I've never had any issues with .308 in a armed forces surplus burglarize. Probably a combination of the slightly different headspaces and of the better QC of commercial ammo.
    - My Speer reloading manual doesn't distinguish between the two. It really lists the .308 data equally having been calculated and tested using IMI 7.62x51mm casings rather than commercial .308. It also cautions that military brass is usually thicker, resulting in less example capacity, which means that you need to make sure you lot aren't stuffing too much powder in it.

    A lot of what yous need to know almost interchanging them though depends on what rifle you're using.
    What rifle are you using?

  10. 35 Whelen
    • Contributing Member

    35 Whelen Contributing Member

    This issue was FINALLY put to rest some fourth dimension dorsum on another forum by a Technical Director of an ammo company. He was repeatedly challenged in the thread, but ever, always was able to reply the questions and based everything he stated on fact. Yous can read it hither: 7.62 NATO Pressure level vs. commercial 308 Winchester

    If you take the time to read the posts, delight do and then with an open listen. As you'll see, there are plenty of buffoons out there who disagree regardless of the facts presented.
    Regards,
    35W

  11. 35 Whelen,

    Thanks for that link. I have been arguing for years that while the vii.62x51's pressure level is listed at 50k psi, it was established using the copper crusher method and is in fact a Cup measurement which puts information technology in the same pressure category as the .308 Winchester'southward 62k psi pressure spec using the piezoelectric method. The only real concerns well-nigh interchanging the ammo are: the lighter construction of some commercial .308 brass which may overly expand in a "generous" 7.62x51 chamber; and a possible platform limitation such every bit a M1 Garand converted to 7.62x51 or .308, in which the oprod cannot handle the higher port pressures generated by the slower called-for powders used in nearly .308 commercial ammo.

    Don

  12. The virtually of import departure betwixt .308 Winchester and 7.62x51mm NATO is the sleeping room in the gun. 7.62 NATO chambers are much longer than .308 Winchester, to the point that a NO-Go gauge in .308 Win is withal shorter than a seven.62 NATO Become judge. Firing .308 Winchester in a 7.62 NATO sleeping room is the equivalent of shooting information technology in a .308 Win rifle that volition close the bolt on a field gauge with plenty of wiggle room left over. This is pretty much the definition of an unsafe gun/ammo combination.

    vii.62x51mm NATO gets away with these incredibly loose chambers because it has very thick brass. When the instance flows nether pressure level, in that location are enough of reserves at the base to ensure that enough contumely remains to prevent gasses from rupturing the metal. .308 Winchester is much thinner considering it's fabricated in anticipation of a much tighter sleeping accommodation; information technology won't accept to period much, so information technology trades the extra case fabric for higher capacity. Because of the college capacity and the civilian powders used in many .308 cases, .308 tends to get better operation than 7.62x51mm NATO.

    The performance difference, plus the fact that several sources list seven.62x51mm NATO as rated effectually 50K PSI and .308 Winchester at 62K PSI max, has led many to conclude that .308 Winchester is loaded to a higher pressure than seven.62 NATO. In reality, the 50K PSI figure came about considering of different measurement techniques and mislabeling; information technology'south really a CUP measurement, and 50K Cup translates to nearly 62K PSI. The difference in operation between .308 Win and seven.62x51mm NATO come from the old's increased instance chapters. The real reasons non to use .308 Winchester in a 7.62mm NATO rifle are twofold: First, .308 Winchester tin damage a military semi-auto built around the more sedate ballistics and pressure curves of 7.62mm NATO. More chiefly, though, 7.62x51mm NATO chambers have far likewise much headspace to be safe shooting .308 Winchester ammo.

  13. My M1A has a caput space of i.631. While the rifle is advertised as existence chambered for 7.62mm NATO, this is technically out of spec (vii.62 bedroom Get spec is 1.634, afaik). But it also ways that it can safely chamber and burn down both vii.62 and .308 ammo, no problem (gas system pressures however).

    The bottom line is to get your burglarize's headspace measured before you get firing .308 in an old, worn 7.62 marked rifle.

  14. Afterward reading everything here, I've decided to continue using both 7.62 NATO and .308 Winchester in my Ishapore 2A commodities activity. I WOULD NOT Practice THIS if I nerveless my brass for reloading, since thin commercial contumely might deform too much in a loose military chamber, merely with new brass I'm not concerned virtually a rupture.
  15. goon

    goon Member

    Joined:
    January 20, 2003
    Messages:
    7,265
    35 Whelen - Thank you.
    That is almost the almost informative give-and-take on this topic I've ever seen. I added it to my Favorites.
  16. thank you 35 whelen my head is some what clearer... maybe....
  18. Yous can generally shoot .308 commercial in a 7.62X51 chambered rifle as long equally yous stay with bullet weights no heavier than 168 grains.

    If y'all reload .308 cartridge cases fired in a 7.62X51 sleeping accommodation, information technology is strongly recommended that you anneal the case prior to resizing every time and limit the number of reload cycles to ii.

    vii.62X51 is generally not recommended to exist fired in a commercial .308 chamber mainly considering of the longer headspace dimension and thicker brass of the NATO specification cartridge.
    This will usually result in a stuck commodities sooner or later.
    The pressures the cartridges develop are like if the bullet weights are kept below 168 grains and the shooter is non trying to apply high pressure level commercial .308 Winchester cartridges, i.e. 'light magnum'.

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Source: https://www.thehighroad.org/index.php?threads/7-62x51-can-be-fired-in-308-and-vise-virsa-right.376239/

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