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Thread: 308 ak

  1. #311
    No Hope For Me 1biggun's Avatar
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    xxx.
    Last edited by 1biggun; 03-06-2016 at 11:09 PM.

  2. #312
    Gunco Rookie ak310's Avatar
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    For shooting commercial i think id go with 54r. the 308 commerical loads are often catered to bolts that might be bad even if winchester loads are well under max specs. i think most of the spec loads are going to be at least 4ksaami psi under max for liabilities. who knows how long 300wsm holds up or if it will fail in that config. magnum stuff is scary i would only shoot 300wsm with string hiding behind somtin..

    i figure standard akm bolt 762x39: 3.14 * .2235^2=.156" bthrust 8000psi@51500max, modified in 54r pressures 3.14 * .2435^2=.186" bthrust 9670psi@52000psi 10500psi@56500max and with 308win 3.14* .2354^2=.174" bthrust 10800 @62000max . medium loads i hope might get around 17% more bthrust with 54r and similar pressure 308. The heavier 203gr 54r spam loads are probably closer to max psi and greater weight bullets add more stress on bolt lugs plus it overgasses because of the load difference thats why peoples PSLs have excessive wearing after firing many heavy grainers and no regulated gas.
    the 54r case is more limited in pressures, 56.5k psi and 7.62x39 is 51.5k psi so 54r is at least around 6k less than max 308win.. My purpose would be long range target/hunting maybe elk out of standard akm parts.

    now i dunno which idea i like more, for ak700 remington rifle you describe id go with big and slow round 250gr 358 win or heavier 300-400gr 45/70 like calibers. those could be made upto mimic rus 9x39 for a subsonic thumping ak and the weight of the round would make it effective on med/big game

  3. #313
    No Hope For Me 1biggun's Avatar
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    xxx
    Last edited by 1biggun; 03-06-2016 at 11:09 PM.

  4. #314
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    xxx
    Last edited by 1biggun; 03-06-2016 at 11:09 PM.

  5. #315
    Gunco Rookie ak310's Avatar
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    i miswrote weight of bullet on lug i mean high press loads, specifically refering to guys that shot their PSL for few years with 203gr 54r biger game hunting loads probably hot spam can or hotter reloaded. I dont know if they had more issues like headspacing,lugsetback or what but for semi auto dmr meant for med loads it does cause increase wear on metal contact areas and rear trunnion/mspring rod from overgas and increased thrust.

    i would agree geometrically m77/galil 308 bolts are pretty analogous to m70/trun, but what about composition of the metal differences and in heat treatment like some people suggest. I dont know.

    762nato ~2,000 less psi and thicker case is good. 54r build from m70 would be tough just thinking about bolt/reciever is too much work. i think the best option in 308 is going 762nato thick brass and reloading withheavier lead cast is a great option for this build.

    For these builds lower threshold is good, but its not exact science. i might consider target 762nato as hot load for conversion and fairly acceptable, loads like u say to 307 / 300savage levels looks like a good level \ around 50k psi. IT is reasonable to think 100 rds a year of 308win federal whatever might be fine for a lifetime, but step it up in frequency and rapid firing or increase overall to thousands of rounds of standard loaded 308win inl yugo m70 it may fail or show significant wear to other parts.

    Supply is dry especially for the lower base production battle rifles kits, the challenge is finding bolts 308 galil/m77 and m76 even PSL bolts - i dont see them anywhere from main suppler companies only luck is by buying private/forum sellers.

  6. #316
    Gunco Regular willie's Avatar
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    Over on akfiles and on GB there is a guy selling M76 parts and seems to have a good supply. I picked up a NIB M77 after ffl fees and shipping was less than $560 total.

  7. #317
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    xxx
    Last edited by 1biggun; 03-06-2016 at 11:10 PM.

  8. #318
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    xxx
    Last edited by 1biggun; 03-06-2016 at 11:10 PM.

  9. #319
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    [xxx
    Last edited by 1biggun; 03-06-2016 at 11:11 PM.

  10. #320
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    Last edited by 1biggun; 03-06-2016 at 11:11 PM.

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