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PostPosted: Tue Apr 05, 2011 2:07 am 
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Bad news from my gunsmith.

He called me yesterday that the UK59 barrel did not have enough threads to headspace in the

Hungarian M44 action that I decided to use.

He told me that he had to take out the cut for the bolt lug, extend the threads and rechamber.

He called me today that the reamer was not cutting the chamber because the barrel was chrome lined and
that there is no way to rechamber to head space it.

There go my dreams of having a heavy barrel MN.

What have other people done to ream and headspace??

Any suggestions??

Oscar

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PostPosted: Tue Apr 05, 2011 11:21 am 
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get a different heavy barrel or a different gunsmith?

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PostPosted: Tue Apr 05, 2011 1:02 pm 
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barrel sleeve?

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PostPosted: Wed Apr 06, 2011 11:20 am 
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What about facing off the action? As long as it's only a 1/8th or so I wouldn't think that would hurt anything. I believe facing 1/16th off the receiver will give another full turn of the barrel unless my math is way off (threads are 16 per inch). If more than a 1/8th is needed to headspace, you may be S.O.L.

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PostPosted: Fri Apr 08, 2011 11:47 am 
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Get a gunsmith with a clue.

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PostPosted: Fri Apr 08, 2011 3:42 pm 
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Burner wrote:
Get a gunsmith with a clue.


Burner,

That is not the problem, the issue is that those barrels are chrome lined and the reamer wont work on them.
I guess that if you are lucky in getting a barrels that clocks perfectly with the action you have "whala" you got it.
The two barrels that I got when screwed by hand into the same action, they fit completely different one from the other.
My gunsmith is a very capable smith he is a retired armorer (if the word is correct) from the military, he has put
together rifles for me that are sub moa, so it is not a matter of experience.

Oscar

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PostPosted: Fri Apr 08, 2011 11:06 pm 
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While his answer is short - Burner is right....

If you look at that UK59 barrel next to your Mosin barrel - the original "Torque Shoulder" is about 1.5" from where the Mosin Barrel's torque shoulder should be...... It's the right diameter for a Mosin Nagant rifle - so your smith probably assumed that he had to cut the existing threads off the UK59 barrel, rethread the non-threaded shank, and re-chamber....

But... there is a shiny turned down shank section that is a hair over 1" diameter and the Mosin threads run right about 0.960-ish.... If you look carefully at other people's projects - that turned down section acts as the torque shoulder.... I have no idea how a 0.025" per side "Shoulder" is able to hold the torque and recoil impulse... but it apparently does....

If it was me - I would do what Alex mentioned - make a sleeve that's about 1.120" OD and 1" ID, turn the shank section down to 1" OD - and press that sucker on with sleeve retainer locktite.... Then, use that to be the barrel's torque shoulder..... But... It's not what most people do - they just screw the barrel on and it seems to run fine.

Thanks


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PostPosted: Sat Apr 09, 2011 3:28 am 
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We tried first the Hungarian M44 action, if you have removed barrels from both a Tula
1935 Hex receiver and a Hungarian Mosin Nagant, they are different.

The Tula Hex receiver has an internal torque ring and the Hungarian MN does not.

If he screwed the barrel into the M44 action, the headspace was too loose, that is why
he had to move back the torque shoulder and make a longer thread.

Oscar

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PostPosted: Sat Apr 09, 2011 2:47 pm 
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If you look at the Mosinnagant.net or 7.62x54r.com pages - you will see that the Soviets used several different flavors of internal shoulder inside the receiver.... From what I have read - it wasn't a torque shoulder like a Mauser.... (I am not claiming to be an expert here...)

If he moved the outer barrel shoulder back a hair to make it headspace right, then the barrel hit on the inner shoulder and it still wouldn't headspace - I think I would slightly turn down the threaded end of the barrel hitting the inner torque shoulder so it would headspace right. If he turned it down too much - he will need to make a spacer.

Now - you can buy reamers to cut chrome... Carbide reamers will do the trick... but they cost ~2x what standard reamers cost... but given that you already have 2 barrels sunk cost... it may be worth it. Give PTG a call.

Thanks


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PostPosted: Sat Apr 09, 2011 5:55 pm 
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truckjohn wrote:
If you look at the Mosinnagant.net or 7.62x54r.com pages - you will see that the Soviets used several different flavors of internal shoulder inside the receiver.... From what I have read - it wasn't a torque shoulder like a Mauser.... (I am not claiming to be an expert here...)

If he moved the outer barrel shoulder back a hair to make it headspace right, then the barrel hit on the inner shoulder and it still wouldn't headspace - I think I would slightly turn down the threaded end of the barrel hitting the inner torque shoulder so it would headspace right. If he turned it down too much - he will need to make a spacer.

Now - you can buy reamers to cut chrome... Carbide reamers will do the trick... but they cost ~2x what standard reamers cost... but given that you already have 2 barrels sunk cost... it may be worth it. Give PTG a call.

Thanks


The Hungarian M44 does not have that innter torque (if you want to call it) ring, it is just threads.
You have to torque the barrel with the receiver face and the barrel like small ring Mausers.

Oscar

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PostPosted: Mon Apr 11, 2011 8:42 pm 
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Breaching washer on a spacer, instant headspace..
On a barrel with no sights you have nothing to time, just torque and re cut another extractor groove.

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