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Thread: 6.5x55

  1. #31
    Gunco Member ohiobruce's Avatar
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    Thanks for the info and the bump. I read the 308 thread and have a few more questions. I calculated bolt thrust for both rounds per info in the thread and came up with the following:

    6.5x55 (.480 dia) = .181 x 45000 psi = 8145 pounds
    7.62x39 (.440 dia) = .152 x 45000 psi = 6840 pounds

    Iím not an engineer, but I donít think itís this simple. There should be some difference in bolt thrust depending on bullet weight, right?
    How about if I rebated the rim on the 6.5? If I turned it down to .440 it wouldnít lessen the force on the bolt face, right?

  2. #32
    No Hope For Me 1biggun's Avatar
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    There should be some difference in bolt thrust depending on bullet weight, right?
    How about if I rebated the rim on the 6.5? If I turned it down to .440 it wouldn’t lessen the force on the bolt face, right?

    NO AND NO

    the bullet weight has nothing to do with it the pressure is the number you use. Now if you were calulating recoil then the bullet weight has a big factor.


    as far as rebating or adding a rim it will not change the the amount of bolt thrust. you actualy need to use the inside of the case ID to do the caluclations. think of it this way if you were to jack up your car with a bottle jack and you placed a board under it and had 2000 pound of weight on the board. then placed a smaller board between the jack and the original board you would still have the same weight on the original board. the pounds per square inch would be the differant from board to the other but the total weight would be the same.. ( I THINK I SAID THAT RIGHT IVE HAD A FEW RUM AND COKES AND ITS 130 AM and im no enginere either.LOL)

  3. #33
    Happy Camper hcpookie's Avatar
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    Quote Originally Posted by 1biggun View Post
    HC what does a psl handguard look like Any pictures????? I have some odd ball stuff im not sure what it is.
    The handguards in this picture... I can get the thumbhole stocks, they are the same as on the WASRs and several are usually FS on the auction boards, but I have yet to see the handguards go up for sale:

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  4. #34
    Gunco Member us_dragunov's Avatar
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    Quote Originally Posted by hcpookie View Post
    The handguards in this picture... I can get the thumbhole stocks, they are the same as on the WASRs and several are usually FS on the auction boards, but I have yet to see the handguards go up for sale:

    For years TNGUNS had them for sale and I was going to link you to them now, but I don't see them on their site anymore. You might want to call them and ask if they have an extra set laying around. K-VAR used to sell them too.

  5. #35
    Gunco Member ohiobruce's Avatar
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    Thanks, 1Biggun. Using the inside ID makes a lot more sense.

  6. #36
    No Hope For Me 1biggun's Avatar
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    The handguards in this picture...
    HMMM I dont have a set of those but I sure wish I did. I like the looks of that gun. Ill be on the lookout.

  7. #37
    Happy Camper hcpookie's Avatar
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    Quote Originally Posted by us_dragunov View Post
    For years TNGUNS had them for sale and I was going to link you to them now, but I don't see them on their site anymore. You might want to call them and ask if they have an extra set laying around. K-VAR used to sell them too.
    Yeah I know... figures everyone sells out right when dad wants to build one. I should never have let him see my PSL!

    I can't find a number for them... only a web form. Never can tell if those get read or not!
    Gunco Member #10

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  8. #38
    Happy Camper hcpookie's Avatar
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    Well I got some of those IMA 7.5mm mags and it looks like they WILL work for the longer 140 grain rounds! These aren't actually the RIFLE magazines with that cool tab - these are the MG magazines! It appears they are 25-30 rounders but I haven't loaded one up completely due to the amount of cosmo in the mags.

    I suggested to him not to use .308 mags but rather to use a magazine capable of using *any* 6.5mm round since you never know if we'll ever want to run some service ammo. Need to clean some of the cosmo off so I can do more testing

    The .308 magazine will work as-is for his lighter 100 grain loads but are just a tad too short for the 140 grainers. The 7.5mm mags are a tad on the long side, but not long enough to cause the rounds to tip if they slide forward like they do in the 8mm magazine.

    These 7.5mm mags also have a last-round BHO tab

    I'm planning to make floorplates for one US compliance part. They are similar FAL floorplates in that they are simple flat tabs. Since we'll most likely be getting a US-built barrel, that's 5 parts already - floorplates, barrel, receiver, piston, and muzzle brake. If we end up making those handguards (like it looks like we will!) then there's #6!
    Gunco Member #10

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    The "original" Boltcutter Rivet Squeezers:
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    Project Pink - the Pink and Blue AK-74:
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  9. #39
    No Hope For Me 1biggun's Avatar
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    I suggested to him not to use .308 mags but rather to use a magazine capable of using *any* 6.5mm round since you never know if we'll ever want to run some service ammo.
    I agree. besides the beauty of the 6.5 is the ability to shoot the high BC bullets like the 147 GR,s that the 1000 yard guys use. You might as well make that thing reach out and touch something if your going to all the trouble. with a good barrel this could be a tack driver. post some mag pic when ever you get a chance. I wonder if a 7mm mauser would fit in one?? HMMMM Im looking for deals on 6.5 barrels for my 260 Remington I pass on any thing I find.

    Im researching twist rate for thr high BC bullets

  10. #40
    Happy Camper hcpookie's Avatar
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    There are a few 6.5 barrels on Numrich in the $150 range. They are listed as Mauser replacement barrels. We are planning on the 24" model with that 21" model as a 2nd choice.

    A few mock-up pics- remember these are the MG mags, not the MAS mags. I confirmed that these are 25-rounder mags! Using a metal handle to simulate the bolt, I can lock the mag up in the vise's rubber jaws and strip rounds without any tipping problems. The front of the mag lips are a little cramped and can shave the brass some, and so I think I will need to cut them back some to be closer to the AK magazine lip style.




    Compared to .308 mag:




    I think the challenge on the magazine will be to get the rear locking lug welded up on the back of the follower extension. The bolt hold open on these mags are LONG!

    Gunco Member #10

    http://pookieweb.net


    The "original" Boltcutter Rivet Squeezers:
    http://pookieweb.net/AK/rivet/boltcutters/boltcutter.htm


    Project Pink - the Pink and Blue AK-74:
    http://pookieweb.net/pink/pink.htm

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