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  #1  
Old 04-16-2013, 07:29 AM
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Chamber Damage, 7.62x54 Mosin Nagant


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Have a 1955 7.62 x 54 Chinese made Mosin Nagant. There is some chamber damage, the shell ruptures at the neck down area for about 45 deg. this is a complete rupture leaving microscopic openings at two points on the periphery. My plan is to rough up the chamber with a burr, etch the metal with hydrochloric acid, & fill with liquid steel. Procure (rent) a solid pilot reamer and reform the chamber.
Would like some comments regarding the above as I have never done this to a rifle chamber before.
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Old 04-16-2013, 08:07 AM
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Sorry about the Mosin. Good luck on your upcoming project. Keep us in the loop.
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  #3  
Old 04-16-2013, 08:12 AM
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I don't see much chance of success on this. Making a smooth chamber would seem to require a smooth pilot hole through the barrel. Don't know what a chamber reamer will if it's unsupported and randomly contacting the chamber wall.

Then, what is the compressive strength of the stuff?

Probably easier to just pull the barrel and find another, my guess.

Good luck either way.
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  #4  
Old 04-16-2013, 08:48 AM
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Pour a chamber cast first, you might be able to view the damage.

Clean the chamber well and try several types of ammo, surplus and commercial. It may be the ammo that is bad.
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  #5  
Old 04-16-2013, 08:57 AM
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Ditto on the ammo exchange and to cast the chamber.

Don't think you'll have much success with reforming the chamber, and as Mike G says, dubious pressure retaining. Might just follow the first shot down the barrel.
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  #6  
Old 04-16-2013, 09:12 AM
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I dont think it's the ammo two different types of cartridges showed the same damage, one was brass the other steel. As far as the barrel, this is one piece receiver & barrel. As for making a cast, Im not sure I can retrieve the casting without destroying the section protruding into the damage section. The weapon is of no use except show so, why not give the liquid metal a try ?
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Old 04-16-2013, 09:43 AM
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I was trying to envision "a complete rupture leaving microscopic openings", and was having trouble doing so. A chamber cast will show you the problem that needs solved, and may help in determining the solution. If you are using something like Cerrosafe, and retrieval is a problem, then just melt out.

You should be able to cast a short section of the chamber, that may help in retrieval.

The liquid metal idea might work, but I have serious doubts. I'm more inclined to think that the reamer will be pushed aside which will damage the chamber even further.
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Old 04-16-2013, 10:27 AM
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Is there a way to attach a photo to these threads, if so, I can show the rupture and may help describe the damage.
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Old 04-16-2013, 10:34 AM
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You've just reached the requirement of 25 posts.

From the page where you type a "reply", scroll down a bit to the section marked Additional Options.
Select Manage Attachments, from there you can upload pics directly from your computer.

Or you can use a pic hosting site, such as Photobucket, then just leave a link in a post.
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  #10  
Old 04-16-2013, 02:59 PM
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From the photo you can see the two rupture points, this cartridge can substitute for a casting. It shows the location of the damaged area and the depth. Im not sure the file attached. It shows attatched.
Attached Thumbnails
Chamber Damage, 7.62x54 Mosin Nagant-7.62-x-54-casing-1.jpg  
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  #11  
Old 04-16-2013, 03:36 PM
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Well, I wouldn't say it's a substitute for a casting. A case is subject to high pressure expanding outward that then shrinks, while a cast is a copy of the chamber without all the pressure.

An alternative title for the thread could be "Why are these cases split?".
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Old 04-16-2013, 05:48 PM
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Um......... I don't think I would shoot that gun any more!

You sure the barrel and receiver are one piece? That's not typical for a rifle....
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Old 04-16-2013, 06:03 PM
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I' d make my brother in law a good deal on a rifle.
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  #14  
Old 04-17-2013, 01:33 AM
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Guess I'm behind the eight ball here since I don't recall ever seeing a Chinese Mosin. I'd assume they were licensed copies and maybe produced on Russian machinery. That being the case, the barrel would be screwed into the action, although it may not appear so. If you can get the barrel off the action it would be a simple matter of setting back and rereaming the chamber. If the barrel can't be removed I know of no easy proceedure to restore that chamber.
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  #15  
Old 04-17-2013, 01:57 AM
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All that work for an action/barrel that you can buy for <$200 in just about any LGS? I'd find a way to rechamber to a slightly longer/fatter cartridge or just scrap the barrel and start over. I've not seen a one piece barrel/receiver, on a Mosin or any other modern rifle.
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  #16  
Old 04-17-2013, 01:15 PM
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I have mapped the chamber of the rifle relative to specifications. It appears the forging or casting had poor integrity with possible slag pockets. From the formation of the area in discussion, the slag concept seems to be the cause. The area is pocketed as a slag formation was knocked out due to shell impact during firing operation. i used muriatic (hydrochloric) acid on the barrel to determine if the metal had chromium, it was conclusive the barrel material was not a alloy like 4140, etc. The remainder of the measurements were within (somewhat) specifications. This now has become a challenge, Im going to try to recover the damaged area with a low grade liquid metal and reform it. From my investigation of Chinese metallurgy in the 1950's and there integrity for forging & casting, Im sure the rifle is for minimum usage, one round, let cool & continue. Ill advise when completed. Until then, being a retired mechanical engineer, I have time to play.
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Old 04-17-2013, 01:30 PM
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I want to make a correction for my previous post. I stated "Muriatic acid", correction: Nitric Acid. use 1:1 Nitric acid / Water solution. 12% chromium material will not etch, < 12% will fume & turn black.
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  #18  
Old 04-17-2013, 02:37 PM
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Honestly - I think I'd be afraid of the thing letting go. No telling what other defects are in the steel.

Up to you, of course.
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  #19  
Old 04-18-2013, 01:46 AM
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I like to tinker with stuff and tend to be a DIY guy, on most things. When it comes to explosions happening inches from my face, I tend to let the experts do their thing. If I screw up the tile on a bathroom floor, the only danger is from my wife.
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  #20  
Old 04-18-2013, 06:41 AM
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Life is full of dangers, do you check your child's tricycle to insure the wheel wont come loose causing the tricycle to tip, causing the child to hit there head on the sidewalk ? How-a-bout the loose board on the front step, someone falls through, did you perceive this and avoid using the front step ? Wife driving kids to ball practice, is the vehicle safe ? Lets get real ! driving on the highway accident probability is 1000 x greater then firing a weapon with a full barrel surrounding the cartridge, full bolt covering the cartridge end, full relief access of force in the hollow barrel ! So, do we hide in a corner all our life, or get out there with the real world ?
I'll get of my soap box now !
Thanks for listening !
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