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  1. #301
    No Hope For Me 1biggun's Avatar
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    Last edited by 1biggun; 03-06-2016 at 11:05 PM.

  2. #302
    Gunco Regular allesennogwat's Avatar
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    The Russian tried making 308 AK's with AK-74 type bolts and they failed to pass the CIP proof testing in Europe. CIP proof is 125 percent of the standard pressure limit. The Russians then changed the bolt design to the three lug bolt. The 308 Valmet and the Yugoslavian 308 AK both use longer and heavier bolts but they were both designed before the CIP proof testing was required for sales in Europe. Then there is the 8 mm M76 and now a 308 PSL. I have heard of the 308 Galil receivers cracking.

  3. #303
    No Hope For Me 1biggun's Avatar
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    Last edited by 1biggun; 03-06-2016 at 11:06 PM.

  4. #304
    Gunco Regular allesennogwat's Avatar
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    Quote Originally Posted by 1biggun View Post
    I read a story on threm years ago (possably internet BS) and it said there had been reports of 308 Galil bolts failing.

    I was not aware that the russians tried to use a AK74 type bolt in there testing. I have also heard the the three lug bolt was not due due to previous failures.
    I have also never seen any thing offical saying the 2 lug bolts failed CIP tests i have only heard stuff on forums.
    Do you have any thing that shows or proves that the two lug bolts faild CIP tests??? Id loe see some documintation other than what I always see in forums like this. Im not doubting you or any one else but Id like to see the source of the reports.
    I was told this before I had the internet. Before a certain date, CIP proof testing wasn't required to market firearms in Europe. I think 1989 or maybe 1991 or later. The story I got was the original Russian 308 design was with a two lug bolt which held up using normal ammunition but not the required proof testing. What helps support this story is the Saiga and Vepr were made by two competing Russian companies at the time. If it was just to improve accuracy, as some claim on the internet, I think the more expensive Vepr might have done it but not the cheaper Saiga and not both at exactly the same time. Three lug bolts aren't any more accurate than two lug bolts but they can spread the load over a wider area.

  5. #305
    No Hope For Me 1biggun's Avatar
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    Last edited by 1biggun; 03-06-2016 at 11:07 PM.

  6. #306
    Gunco Regular allesennogwat's Avatar
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    284 Winchester is a pretty fat case. I've seem 6.5mm-284 but for 6mm I would consider 6mm Remington. It is a short action cartridge due to the shortness of 6mm bullets and uses a 7mm Mauser / 257 Roberts case. It's 2.825 inches long and the 308 Winchester is 2.81 inches. That's a larger case than the 243 Winchester and a smaller diameter than the 284 Winchester case.

    6mm Remington - Wikipedia, the free encyclopedia

  7. #307
    No Hope For Me 1biggun's Avatar
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    Last edited by 1biggun; 03-06-2016 at 11:07 PM.

  8. #308
    Gunco Rookie ak310's Avatar
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    I know pookie made a svu 308/g3 mag ak with romanian G parts basically profile of yugo m70 bolt/trun. the yugo m77 308 bolt is 2 lug and i havent seen anything about it failing. all the pics i have seen the top lug is identical to the m70 bolt, the only big difference is the m76 is thicker face becauseit longer distance from mag.

    safety says to stay at the levels of max psi standard caliber the bolt was made for -- 51,500psi 762x39 and 55,100psi 545x39. a 11k-7k psi difference is a decent play with unknown variables of the standard akm/74 bolt/trun. it bothers that there is no info on this, and you never know until you test the bolts/trunnion lugs thresholds yourself.
    I would be tempted to build if it could at least handle off the shelf 308 win loading or 54r(if mosin takeoff could be sourced), video of the action and checking headspace/fatigue/cases after each rd if it makes it that far would be interesting.

  9. #309
    Gunco Member aloharover's Avatar
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    Quote Originally Posted by 1biggun View Post
    I dont know what a 308 Saiga can handle. Id hate to find out the hard way.
    I run my hot 175 SMKs through my Saiga 308 with out any issues. If I do my part I can get 1.5moa out of it. My AR308 is more of a .65-.70 with the same ammo.
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  10. #310
    Gunco Rookie ak310's Avatar
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    Quote Originally Posted by 1biggun View Post
    I have several converted guns that shoot 308 or varients of with standard trunions. So far so good however I reload for all of them and I load tot he light side. .

    There have been reports of 308 Galil's failing. I have seen pics of a Galil bolt and I agree they look very close to a standard bolt but with a bigger face.

    IMOO and my opinion only a 5.45 bolt in a rpk,psl, m70 trunion is likely the strongestr combination the 5.45 bolt lugs are longer that has got to make them stronger IMOO .

    If I had the time, money and the parts Id love to do some improvised proof testing. Id like to see what a standard bolt and trunion can take before head space moves ir some thing lets go.
    i know its old post biggun, but curious in a 308 build and deciding which parts to use. i measured akm bulgar milled type bolt and bulgar ak74 boltto see differences. What is thicker on the 74 is the face .650 vs .720 and the 74s extractor is external ofer top of face, top rotating lug length .372 vs .412, left lug is pretty big difference .412 vs .534. OAL 3.335 vs 3.445 and fpin shaft .430 vs .345. problem i see with the 74 is the chamber face diameter starts .394, i have to bring it to around .480 based on pookies measurement for 308 win base and the bottom left cf side wall would be very thin. lol no idea if that would work out

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