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Thread: 308 ak

  1. #191
    Gunco Regular allesennogwat's Avatar
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    I found out the American Rifleman data dates to 1984. The one powder that I know has changed since then is H4895. The old H4895 was slightly slower than IMR-4895 and was very similar to pre-1976 military IMR-4895. I loaded some LC cases with 43.0 grains of 1972 dated pull-down military surplus IMR-4895 and with a 147 grain FMJ I got about 2700 fps 15 ft in front of a 21" FAL. In the same rifle standard 147gr military ammo averaged 2762 fps and the military ammo with 144gr bullets (Aussie and Portuguese) averaged 2792 fps. This surplus powder is SLOWER than current IMR-4895. Current H4895 is faster than old pre-1999 H4895 and is faster than current IMR-4895.

    American Rifleman recommended 43.0 grains of W-748 in LC cases with a 168 grain match bullet. They say it's about 0.5 to 1.0 grain under max but they don't recommend going more than 43.0 grains and 42.5 grains is also accurate. I tried 43.5 grains of W-748 without trouble but 44.0 grains showed severe overpressure so they are right. I think 43.5 grains is too close to overpressure to trust and I tested the loads in a bolt action, so in an auto rifle 43.0 grains plenty warm enough. 42.5 grains is accurate and not bad in velocity.

    Do not use the old H4895 data shown in the chart. it might not get you in to trouble but the current made in Australia H4895 is faster.

    The information from the series of 1984 articles is reprinted in an NRA book titled "Semi Auto Rifles".

  2. #192
    No Hope For Me 1biggun's Avatar
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    xxx
    Last edited by 1biggun; 03-06-2016 at 11:42 PM.

  3. #193
    Gunco Regular allesennogwat's Avatar
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    Somebody told me 42.0 grains of W-748 with a 168gr SMK in LC brass is accurate. That should be reasonable pressure. I didn't buy the newest Hornady #7 manual but it has service rifle loads in commercial cases. I did glance through at a local gun shop that unwraps one copy of each load guide for people to look through while buying components. it's about a 100 mile drive from me. I haven't loaded many 125 grain bullets in 308 Win but even at starting loads it should beat 7.62x39. You don't want to start too low or the cases won't expand enough.

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  5. #194
    No Hope For Me 1biggun's Avatar
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    [xxx
    Last edited by 1biggun; 03-06-2016 at 11:42 PM.

  6. #195
    Gunco Rookie desert fox's Avatar
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    Ok guys, i just spent a couple hours reading through this thread and I just am checking to make sure it is safe to build an AK47 in .308. I realize hcpookie didi it but I just want to make sure its safe

  7. #196
    Gunco Member aloharover's Avatar
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    Saiga makes 3 different 308 AKs
    U.S. Army (Ret)
    NRA for Life

  8. #197
    Gunco Regular allesennogwat's Avatar
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    Quote Originally Posted by desert fox View Post
    Ok guys, i just spent a couple hours reading through this thread and I just am checking to make sure it is safe to build an AK47 in .308. I realize hcpookie didi it but I just want to make sure its safe
    Be aware that factory 308 AK's have longer heavier bolt lugs. At least the right bolt lug which is suppose be the main one. They are all made on milled receivers or RPK type trunnions. The Saiga and Vepr 308 rifles have three lug bolts. It may not blow up but I think it might be pushing the standard design AK a bit. At least use an RPK type trunnion and inspect the bolt and trunnion often.

  9. #198
    No Hope For Me 1biggun's Avatar
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    Ixxx
    Last edited by 1biggun; 03-06-2016 at 11:43 PM.

  10. #199
    Gunco Regular allesennogwat's Avatar
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    Well it looks like the 308 Galil uses a standard size bolt and the 308 Valmet and Yugo use oversized bolts. The extractor pivot is moved out and the bolt is cut away on the outside to clear it. The length is standard AK. A 308 Galil bolt might better to use than a standard AK bolt milled out. So the barrel location must be standard and I know the 308 Galil magazine is one of the best as it's based on the M14 magazine. I was thinking about reaming a Yugo barrel for 308. I know the bore would be a bit large but it should function. Would be cheap for a test. I could have a 308 barrel made for it later. I was worried there might not be enough space to feed from the magazine to the barrel.

  11. #200
    Gunco Veteran Viper Dude's Avatar
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    I keep wondering why no one tries the .308 Barnes kurtz. It is .308x1.5 inch and should fit the 7.62x39mm AK mags and action. The round can be hand loaded up to 52,000 psi (or more). A big advantage of this round is the use of the .308 Win case or mil surp cases or even spent mil surp 7.62x51mm blanks !!

    A 7.62x39mm barrel could be rechambered to this round though the bore is a bit generous. Perhaps a paper patch or use of .311 inch bullets would help tighten up groups.

    The .308x1.5 Barnes kurtz has been briefly mentioned here before but that was all.

    VD

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