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Thread: Green moutan barrel blank (7.62x39)

  1. #41
    Gunco Veteran jreifsch80's Avatar
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    That would be cool if they would offer a longer .311 blank I'd buy one I'm sure.

    One thing I noticed though, is their 27x1.2 8mm blank for about 96 bucks. I totally am thinking of getting it and having it turned as thick at all its dimensions as possible while still accepting my m76 barrel components hehe is roughly 26 inches too much barrel for 8x57? It would be my super 76 hehe

  2. #42
    No Hope For Me Coils's Avatar
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    is roughly 26 inches too much barrel for 8x57?
    I don't think so, the Mauser 98K has a 24" and a Mosin Nagant 91/30 has a 29" barrel.
    "Government is not the solution to our problem, government is the problem" Ronald Reagan

  3. #43
    Gunco Veteran jreifsch80's Avatar
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    Nice haha I need to get that blank then, though my m76 would maybe go from heavy to shoulder spasm heavy haha. But it would be cool. I can imagine it now if I keep it as close to 27 inches as I can with the flash hider it might be almost 30 inches haha awesome.

  4. #44
    No Hope For Me 1biggun's Avatar
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    Id keep it a around 24" 26 being the longest. i dont think you will gain much after 24. rememaber the you only want as long of a barrel as needed to get the best velocity VS barrel stiffness the shorter the barrel the less it will walk and flex etc. If i could get the speed out of a shorter stiffer barrel I would. Unless your looking for a certain look Id gow ith a practical length. 8mm is pretty close to a 30-06 in case capacity etc and you seldom see 26: barreld 30-06's any more most are 22" or 24".

    Im going to try a super heavy barrel pistol at some point with about a 13" barrel I think one of the reasons mY AMD 65 is more accurate than many of my 16" barrels rifles is that the short barrel is stiffer and actualy braced by the suoer tight fitting gas tube that holds my scope mount. If these GM barrels will give any type of decent accuracy then Ill try one on a hunting pistol. Im not expecting much for $30 BTW.

  5. #45
    Gunco Veteran jreifsch80's Avatar
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    thanks big gun i was realisticly thinking somewhere between 24 and 26 inches. from what i've been reading there are some gains to be had with 8mm having a 26 inch barrel over a 24" when reloading and slower powder and it doesn't really seem to hinder factory/surplus perfomance, also instead of tappering like the factory m76 barrel i will have it step keeping each part of the barrel as thick as i can with it being just slightly smaller than the gas block all the way till the last few inches where i'll step it down for my front sight/fh. or is the gradual tapper the m76 has a better design?

  6. #46
    Gunco Regular mrtank's Avatar
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    Well I gave them a call. Talked to them about just labeling the land and grove dimensions of the barrel since it can be used for more things than 7.62x39. Also inquired about a longer barrel blank, they are looking at it but are going to be doing some AR barrels for a bit.

  7. #47
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    I ordered two of the GM blanks, which came in last week. I just checked the bores, and one is .314, the other .315 across the grooves.

    All my AK barrels are in the shop at the moment, but my Mosin was handy and miked at .315.

    This is just with a dial caliper.

  8. #48
    No Hope For Me 1biggun's Avatar
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    I just checked the bores, and one is .314, the other .315 across the grooves.
    HMMMMM they said they were air guaged at one point I think. it never said how tight they held there tolerances. I dont expect much for $30 but well see what they can do.

    I have a ruger bolt action that was very very accurate Im tempted to screw a barrel on it to see defenitivly what is possable in a 7.62x39 perhaps a .308 barrel as well. the action has a 1"-16 thread so it would be doable.

  9. #49
    Where's my lathe? ashhoe's Avatar
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    Keep in mind a caliper is not the same thing as slugging the bore and throwing a micrometer on the slug. Calipers are great when close tolerances arenít needed.
    member # 575

  10. #50
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    That's why I specified how I measured it.

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