7.62x51 out of a 7.62x54 rifle?

7.62x51 out of a 7.62x54 rifle?

This is a discussion on 7.62x51 out of a 7.62x54 rifle? within the General Firearm Discussion forums, part of the Related Topics category; Just to show my ignorance, can you do this or is something bad gonaa happen? It seems to be a really small difference, and I ...

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Thread: 7.62x51 out of a 7.62x54 rifle?

  1. #1
    VIP Member Array Cupcake's Avatar
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    7.62x51 out of a 7.62x54 rifle?

    Just to show my ignorance, can you do this or is something bad gonaa happen? It seems to be a really small difference, and I have this thing where I'd rather not stockpile a bunch of different rounds. Just a few if I can get away with it.
    Spend few minutes learning about my journey from Zero to Athlete in this
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  2. #2
    Distinguished Member Array randytulsa2's Avatar
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    Do NOT even think about trying it.
    "...bad decisions that turn out well often make heroes."


    Gary D. Mitchell, A Sniper's Journey: The Truth About the Man and the Rifle, P. 103, NAL Caliber books, 2006, 1st Ed.

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    You could do it once....

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    Something bad is going to happen! IF you could get the .308 to fire it's case would come unhinged due to the smaller diameter of the case. Without proper chamber support it'd fail, dumping high pressure gas where it wasn't suppose to be, back in the action and in your face. I don't know how well a Mosin Nagant vents in the event of a failure and wouldn't want to find out. At the very least you'd received a face full of gas in your eyes and up your snoot. At worst the rifle would rupture and sling metal shards all over the place.

    Without fetching a .308 case and my son's M44 I can't be certain but imagine that the .308 would orient itself too far forward in the chamber to be able to be fired. The Mosin Nagant extractor wouldn't hold it against the bolt fact where the firing pin could properly strike the primer. I suppose one could aim straight up and allow gravity to hold the case against the bolt face but then he'd be touching off a round that operates at a higher chamber pressure than does the 7.62X54. Not a good idea at all so DON'T TRY THIS AT HOME!

    I was standing less than 18 inches to the left of an M1 that blew the side out of its stock. A friend was firing an M1 he'd just inherited from his uncle with some Frankfort Arsenal '43 dated ammunition when the rifle let go. Best guess was that the case head wasn't properly annealed in the manufacturing process and so was dead soft. It cracked through the flash hole, case head and up the side of the case. The M1 has good gas handling properties and vented into the clip well. From there the gas blew the side out of the stock and slapped me with splinters. Neither the shooter nor the rifle itself were the worse for wear and the splinters didn't really hurt me. The gun was a pristine WWII rifle with all correct parts that'd come home with the uncle after the war. It was a shame to see that wrecked stock. Found another WWII stock but it wasn't the proper one.

  6. #6
    VIP Member Array Cupcake's Avatar
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    Quote Originally Posted by randytulsa2 View Post
    Do NOT even think about trying it.
    Too Late. I've done thought about it.

    Glad you are all here to help, and in my defense, I don't have nor ever held a rifle chambered for 7.62x54 (or a round for that matter). From your quick and emphatic answers I suppose it might've been obvious just by looking at the rounds. I just saw a vintage looking thing dirt cheap at the local sports store and almost bought just because I had the cash in my pocket. But I feel somehow obligated to keep at least a couple hundred rounds for every gun I own. I'm trying to keep it to : .22, .223, .308, 9mm, 12g. Even this seems like too many but I can't bring myself to cut any out.

    Thanks
    Spend few minutes learning about my journey from Zero to Athlete in this
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    VIP Member Array aus71383's Avatar
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    FYI, the 7.62x54R has the "R" because it is a rimmed cartridge. You wouldn't get a 7.62x51 to chamber - it would fly deep into the chamber, the extractor wouldn't hold anything, and the firing pin wouldn't reach. You'd definitely notice the difference between the two.

    Austin

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    All has been answered but - just to aid with visuals ..........


    Chris - P95
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    is like owning a piano and assuming that you are a musician!."


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    Maybe if you didnt value your face you could do it.
    "Just blame Sixto"

  10. #10
    VIP Member Array Cupcake's Avatar
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    Chris,

    Thanks for the pics. The other guys had taught me the answer, but now I understand the answer.



    Quote Originally Posted by SIXTO View Post
    Maybe if you didnt value your face you could do it.
    never has been my money-maker...
    Spend few minutes learning about my journey from Zero to Athlete in this
    Then check out my blog! www.BodyByMcDonalds.com

    Cupcake - 100 pound loser, adventurer, Ironman Triathlete.

  11. #11
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    Quote Originally Posted by LBrombach View Post
    never has been my money-maker...


    As I was reading your question, I was picturing the old Tom & Jerry cartoons when Tom would have something blow up in his face...
    "Just blame Sixto"

  12. #12
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    Embarrassing to say, but I once fired about 6 rounds of 7.62X51(.308) out of a 7.62X63 (30-06 ). I was a young shooter firing a M1 Garand for DCM competition. Another shooter has a M1 converted to .308. He had loaded em into a 8 rnd enblock clips and even put the paper covers on them.
    Luckily I noted after a few shots the casings were coming out straight necked , with the bullet jumping the gap to the chamber. It was inaccurate as all heck too. No damage noted to me or the gun. I got lucky that day.
    "In matters of style, swim with the current; in matters of principle, stand like a rock." Thomas Jefferson


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  13. #13
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    I did something almost as bad; I closed a empty .308 casing in my 30-06 Weatherby... I still havent got it out of the chamber yet.
    "Just blame Sixto"

  14. #14
    Senior Member Array jualdeaux's Avatar
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    Quote Originally Posted by SIXTO View Post
    I did something almost as bad; I closed a empty .308 casing in my 30-06 Weatherby... I still havent got it out of the chamber yet.
    Then you are going to have to take a nice and long metal rod of some sort and pound the casing out from the muzzle.

    I thank God that I've never had to do that personally.

  15. #15
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    Cool

    Quote Originally Posted by LBrombach View Post
    I'm trying to keep it to : .22, .223, .308, 9mm, 12g. Even this seems like too many but I can't bring myself to cut any out.
    Thanks

    Boy, if that's all I had my safe wouldn't be overflowing and I wouldn't have to be shopping for a second one.
    "The price of freedom is eternal vigilance." -Thomas Jefferson

    "Liberalism is a Mental Disorder." -Michael Savage

    GOOD Gun Control is being able to hit your target! -Myself

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