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Thread: HK91 .308 chamber versus the HK911 7.62x51 NATO chamber

  1. #1
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    Default HK91 .308 chamber versus the HK911 7.62x51 NATO chamber

    I have searched the internet and cannot find any valid information that will answer the following two questions.

    The HK91 is stamped .308 and the HK911 is stamped 7.62x51 mm on the receiver.

    For those of you who dont't know, the HK911 is a modified HK91, an HK91 plus an additional 1 stamped on the receiver. The HK911's came with with a barrel shroud and thumbhole stock to allow its sale after the 1989 import ban was imposed. The HK91's that were converted into HK911's were manufactured prior the enactment of the import ban law of 1989.

    Questions:

    Why where these particular HK91's (now HK911's) marked with a 7.62x51 mm chamber and not a .308 Winchester chamber as the original HK91's?

    Was there any particular reason why HK made the change from .308 Winchester to 7.62x51 mm NATO on these particular HK91's?

    Does anybody know the answer to these questions without guessing?

    Thank you for your response,


    Update June-9-2009:

    Additional information about this question can be found in response comment #18. You may want to jump ahead and take a quick look before making a comment.

    http://hkpro.com/forum/showpost.php?...6&postcount=18

    Thanks,

    sam308
    Last edited by sam308; 06-10-2009 at 05:59 AM. Reason: Added Update June-9-2009

  2. #2
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    Well unless you talk to someone who worked at HK at the time in the stamping department I doubt you will ever get the absolute truth. (And I would be highly skeptical of anyone who posts anything here as absolute truth! :D )

    I know that some HK91's are marked 7.62 and some are .308. You may have just gotten one of each and 911/91 thing has nothing to do with it.

    Out of curiosity, what will the definitive answer tell you? Since they both can take either .308 or 7.62 there is no real difference what it's marked as. Much like the SL8 is marked .223 and the G36 is marked 5.56, the receivers are (virtually) the same and both can eat either ammo.

    Also, the title of your post seems to indicate you think that the chamber is actually different. It's not, they have the same chamber, they are just marked differently. HTH.
    Last edited by seven.sixtwo; 06-08-2009 at 06:45 PM.

  3. #3
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    Just like My PSG-1 is marked 7.62X51
    and the hand book is printed cal 308

    who knows why they stamp it the way they do...

  4. #4
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    They're all capable of firing either.

    Sometimes they're marked .308 instead of 7.62 to make it sound more "sporting", that is the ONLY reason. Same thing with marking a gun .223 instead of 5.56.

    Here is a really good one: UMPs are marked .45 AUTO, where as USCs are marked .45 ACP.

    So based on that you should be able to conclude that the markings really has nothing to do with what the chamber spec is, it has more to do with what sounds more politically correct.

    I do love the 7.62x51 marking on my HK911 over the typical .308, it just sounds soooo...military and evil:)

  5. #5
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    Default Thanks all but....

    I know that I can fire both .308 Winchester and 7.62 NATO ammo through the guns, but there is actually a small dimensional difference between the .308 versus and 7.62 x 51 mm cartridges. This has got me wondering if this dimensional difference is reflected in the chambers too.

    This is why I am curious about the .308 versus the 7.62 x 51 mm stamping on the receiver.

    I posted this question on HK USA website forum, but I never got a straight answer.

    Could these 7.62 x 51 mm receivers have originally been planned for making into German G3's and the .308 cal. receivers made for the civilian market into HK91's?

    I guess only HK would really know the answer. It would be really nice to know.

    Thanks again,

    SJ
    Last edited by sam308; 06-10-2009 at 05:39 AM.

  6. #6
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    The actual HK chambers are no different they are all 7.62 Nato (dimensionally) and can handle the (supposed) extra pressure of .308 rounds. Thus, while .308 and 7.62 should NOT be used interchangeably in all rifles they can be in the HK91/911.

    Other notes:
    Do not use the Hornady "Light Mag" .308 in any SA firearm (per Hornady).

    You should NOT use .308 in some rifles that were designed only for use with 7.62 to be totally safe, though I'd bet the chances of you having a problem are remote and I can't even find an anecdote on the internet of someone blowing up a good condition 7.62 rifle with .308.

    The 7.62 vs .308 debate will rage on the internet long after I am gone but as long as you own an HK 91/911 it will not be a problem for you. :D

    762 has spoken.

    PS where are the pics of these three beauties of which we speak????
    Last edited by seven.sixtwo; 06-09-2009 at 12:49 AM.

  7. #7
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    use any military 7.62x51 you will be fine.
    you can even use the fed 308 150gn soft point
    Last edited by Hk33; 06-09-2009 at 01:06 AM.

  8. #8
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    I suspect that, especially for the 9x series, HK used the same tools to bore out the barrel and chamber as they did for the military rifles. I can't see HK making separate tooling for military and civilian 91/G3 barrels.

  9. #9
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    7.62 NATO is different than .308 . The free bore is opened up slightly in the NATO chamber to accept a larger varity of ammo from other nations. We have both reamers and if you bore scope the chamber you can see the difference.

  10. #10
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    Quote Originally Posted by 75bronco View Post
    7.62 NATO is different than .308 . The free bore is opened up slightly in the NATO chamber to accept a larger varity of ammo from other nations. We have both reamers and if you bore scope the chamber you can see the difference.
    I was trained that you can use .308 in a 7.62 chamber but the reverse is not a good idea because the cartridge case at the base and lower sides of the 7.62 is thicker than the .308 and the 7.62 is a military designation used primarily for machinegun ammunition. As alluded to by 75B, the tolerances are greater in the 7.62 to accomadate this dimensional discrepancy and if i am not mistaken the throat of the 7.62 chamber is longer than that of the commercial .308 and the potential increase in CUP pressure related to the absence of that small space in the .308 chamber is potentially hazardous.

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