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 chadweasel 
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Joined: Sep 2007  USA
 Posts: 1145 Feedback: 100% (25) |
Posted: 3/18/2012 2:53:50 PM
THE IMAGE ABOVE IS A PAID ADVERTISEMENT |
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Posted: 3/18/2012 3:00:50 PM
[Last Edit: 3/18/2012 3:05:50 PM by yadayada]
Start by getting GO and NoGO guages to make sure you don't have a headspace issue.
Also remove recoil spring and slowly close bolt on a shell (make sure floating firing pin is retracted). See if the bolt closes easily and retracts the shell. Look inside chamber for damage or other debris. |
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Posted: 3/18/2012 3:25:23 PM
Originally Posted By yadayada:
Start by getting GO and NoGO guages to make sure you don't have a headspace issue. Also remove recoil spring and slowly close bolt on a shell (make sure floating firing pin is retracted). See if the bolt closes easily and retracts the shell. Look inside chamber for damage or other debris. I just did this and the bolt will close all the way and grab the shell and easily pull it out. With the extractor holding the shell it can move in and out freely. I don't really see any damage in the chamber, at least nothing that jumps out at me. |
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El_Guapo
He's more than famous...He's In- famous
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Joined: Jan 2005 TX, USA
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Posted: 3/18/2012 3:32:01 PM
possibly a burr in the chamber. any scratches on the fired brass?
What ammo are you using? |
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Posted: 3/18/2012 3:38:27 PM
Originally Posted By El_Guapo:
possibly a burr in the chamber. any scratches on the fired brass? What ammo are you using? It is steel cased ammo. Here is some spent brass (steel).  |
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El_Guapo
He's more than famous...He's In- famous
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Joined: Jan 2005 TX, USA
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Posted: 3/18/2012 3:49:11 PM
Polish the chamber. You can get a chamber hone at midway for $33.99
http://www.midwayusa.com/product/385775/flex-hone-rifle-chamber-hone-762x39mm-russian-14-400-grit |
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Posted: 3/18/2012 4:26:20 PM
isn't there a jerry-rig solution to this?
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Posted: 3/18/2012 6:05:52 PM
[Last Edit: 3/18/2012 6:08:09 PM by yadayada]
You can try different ammo (brass case). The split at the base may indictate a headspace issue, or an improperly reamed chamber.
When you seat a round by hand, it is tight with no play? Any movement means the shell isn't supported correctly. You also may have bad ammo. BTW, I don't use steel cased ammo in any guns. |
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El_Guapo
He's more than famous...He's In- famous
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Joined: Jan 2005 TX, USA
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Posted: 3/18/2012 6:52:25 PM
Originally Posted By chadweasel:
isn't there a jerry-rig solution to this? 45cal bore brush dipped in polishing compound chucked into a drill Not that I've ever done it 
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Posted: 3/18/2012 8:08:41 PM
Originally Posted By El_Guapo:
Originally Posted By chadweasel:
isn't there a jerry-rig solution to this? 45cal bore brush dipped in polishing compound chucked into a drill Not that I've ever done it
That's what I was looking for.  |
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Posted: 3/19/2012 10:07:22 AM
If you checked the chamber size with the extractor in place, you won't get a correct go-no go reading. If a careful inspection of the chamber with a bore light doesn't show any obvious defects, then I'd say you have a sizing problem. Did you inspect the barrel to receiver for signs of an improper barrel installation? What about the barrel pin? Does it look like it was beat on?
HTH |
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Posted: 3/19/2012 10:59:18 AM
Originally Posted By chadweasel:
Originally Posted By El_Guapo:
possibly a burr in the chamber. any scratches on the fired brass? What ammo are you using? It is steel cased ammo. Here is some spent brass (steel). http://i127.photobucket.com/albums/p143/chadweasel/2012-03-18_15-40-41_257.jpg The necks and shoulders on those fired cases look unusual to me. It's impossible for me to be certain from a photo, but it appears the the shoulder is excessively expanded where it meets the neck. If you have another 7.62X39 caliber rifle or know someone who does, I suggest you compare some fired cases from another rifle. If those cases do not look similar to the cases from the SKS, I suggest you have a gunsmith check the headspace BEFORE you do anything else. |
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Posted: 3/19/2012 11:23:17 AM
Originally Posted By POLYTHENEPAM:
Originally Posted By chadweasel:
Originally Posted By El_Guapo:
possibly a burr in the chamber. any scratches on the fired brass? What ammo are you using? It is steel cased ammo. Here is some spent brass (steel). http://i127.photobucket.com/albums/p143/chadweasel/2012-03-18_15-40-41_257.jpg The necks and shoulders on those fired cases look unusual to me. It's impossible for me to be certain from a photo, but it appears the the shoulder is excessively expanded where it meets the neck. If you have another 7.62X39 caliber rifle or know someone who does, I suggest you compare some fired cases from another rifle. If those cases do not look similar to the cases from the SKS, I suggest you have a gunsmith check the headspace BEFORE you do anything else. You are ready to have a catastophic case head serparation. Headspace is way off. The locking lug needs changed and possibly the bolt itself. |
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Posted: 3/20/2012 12:00:37 AM
Originally Posted By POLYTHENEPAM:
Originally Posted By chadweasel:
Originally Posted By El_Guapo:
possibly a burr in the chamber. any scratches on the fired brass? What ammo are you using? It is steel cased ammo. Here is some spent brass (steel). http://i127.photobucket.com/albums/p143/chadweasel/2012-03-18_15-40-41_257.jpg The necks and shoulders on those fired cases look unusual to me. It's impossible for me to be certain from a photo, but it appears the the shoulder is excessively expanded where it meets the neck. If you have another 7.62X39 caliber rifle or know someone who does, I suggest you compare some fired cases from another rifle. If those cases do not look similar to the cases from the SKS, I suggest you have a gunsmith check the headspace BEFORE you do anything else. 
Here is a comparison pic. This doesn't look too bad does it? |
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Posted: 3/20/2012 12:56:45 AM
[Last Edit: 3/20/2012 1:07:51 AM by yadayada]
Doesn't look good. Compare the shoulder height and shape between the two. Improperly manufactured ammo can cause problems if
the shell doesn't seat correctly. The length from the bottom of the shoulder to the rim will be incorrect, resulting in splits, bulging cases and possibly damage to the gun and YOU. Ditch the steel crap. Steel is sheap for a reason. I don't understand why some spend good $$ on a gun and run crappy steel ammo through it. Try quality BRASS ammo, and see if any problems arise. BTW, several firearms manufacturers void their warranty if steel ammo is used. |
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Posted: 3/20/2012 7:56:35 AM
Originally Posted By chadweasel:
Originally Posted By yadayada:
Start by getting GO and NoGO guages to make sure you don't have a headspace issue. Also remove recoil spring and slowly close bolt on a shell (make sure floating firing pin is retracted). See if the bolt closes easily and retracts the shell. Look inside chamber for damage or other debris. I just did this and the bolt will close all the way and grab the shell and easily pull it out. With the extractor holding the shell it can move in and out freely. I don't really see any damage in the chamber, at least nothing that jumps out at me. to get a proper effect of the go and no go gauge you need to remove the extractor. looking at your pics of the spent brass it looks to me like excessive headspace.. |
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Posted: 3/20/2012 8:09:23 AM
Originally Posted By chadweasel:
Here is a comparison pic. This doesn't look too bad does it? The comparison has to be made to FIRED cases from a different rifle to be valid. But to be honest, that case doesn't look right to me. The shoulder appears to have been set forward. The neck appears to me to be expanded more than normal. Based on what I've seen I would not fire the rifle again until it has been checked for headspace (and perhaps had a cast of the chamber made) by a competent gunsmith. |
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Posted: 3/20/2012 8:17:59 AM
[Last Edit: 3/20/2012 8:19:52 AM by POLYTHENEPAM]
Originally Posted By yadayada:
Doesn't look good. Compare the shoulder height and shape between the two. Improperly manufactured ammo can cause problems if the shell doesn't seat correctly. The length from the bottom of the shoulder to the rim will be incorrect, resulting in splits, bulging cases and possibly damage to the gun and YOU. Ditch the steel crap. Steel is sheap for a reason. I don't understand why some spend good $$ on a gun and run crappy steel ammo through it. Try quality BRASS ammo, and see if any problems arise. BTW, several firearms manufacturers void their warranty if steel ammo is used. The problem has exactly NOTHING to do with the steel case. The rifle was designed by the Soviets to use steel cased M43 cartridges. The tens of millions of steel cased cartridges have been fired through Chinese made SKSs by American shooters since the 1980s. Many times that have been fired through millions of SKSs in other countries before that time and since then. Firing a brass cases cartridge through the rifle in question poses an even greater ris of a catastrophic case failure than firing a steel case (which should not be attempted). Are you volunteering your face and eyes as a test bed? If not, I suggest you learn more and make fewer ill informed posts which encourage people to do things which could injure them. |
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Posted: 3/20/2012 9:03:52 AM
Originally Posted By yadayada:
Doesn't look good. Compare the shoulder height and shape between the two. Improperly manufactured ammo can cause problems if the shell doesn't seat correctly. The length from the bottom of the shoulder to the rim will be incorrect, resulting in splits, bulging cases and possibly damage to the gun and YOU. Ditch the steel crap. Steel is sheap for a reason. I don't understand why some spend good $$ on a gun and run crappy steel ammo through it. Try quality BRASS ammo, and see if any problems arise. BTW, several firearms manufacturers void their warranty if steel ammo is used. Good luck on that Norinco Warranty. |
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Posted: 3/20/2012 11:42:02 AM
The outside shells are from my MAK90. The inside shell is from my SKS. |
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Posted: 3/21/2012 11:27:26 AM
Originally Posted By chadweasel:
http://i127.photobucket.com/albums/p143/chadweasel/2012-03-20_11-43-32_5.jpg The outside shells are from my MAK90. The inside shell is from my SKS. This looks ok doesn't it? |
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Posted: 3/21/2012 3:41:33 PM
Originally Posted By chadweasel:
Originally Posted By chadweasel:
http://i127.photobucket.com/albums/p143/chadweasel/2012-03-20_11-43-32_5.jpg The outside shells are from my MAK90. The inside shell is from my SKS. This looks ok doesn't it? No, no it doesn't. 
Compare the shoulder on the inside shell to the other two, it looks like it's longer. |
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reaper556
Жуков
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Joined: Apr 2009 TX, USA
Posts: 1255 Feedback: 100% (91) Link To This Post |
Posted: 3/25/2012 8:43:57 AM
Originally Posted By TUBBY:
Originally Posted By yadayada:
Doesn't look good. Compare the shoulder height and shape between the two. Improperly manufactured ammo can cause problems if the shell doesn't seat correctly. The length from the bottom of the shoulder to the rim will be incorrect, resulting in splits, bulging cases and possibly damage to the gun and YOU. Ditch the steel crap. Steel is sheap for a reason. I don't understand why some spend good $$ on a gun and run crappy steel ammo through it. Try quality BRASS ammo, and see if any problems arise. BTW, several firearms manufacturers void their warranty if steel ammo is used. Good luck on that Norinco Warranty. I have to agree. After reading that silly shit about not using steel case ammo for a second time in this thread from you I guess ill chime in and remind you its not some shitty AR he's firing here. A SKS and AK and such are made for steel case ammo. Are you suggesting the op truck on down to his local wal-mart or sporting goods store and pay $15 for a fucking box of 20 rounds? I concur with others OP you have a dangerous head space issue with that rifle after seeing those case shoulders |
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Posted: 3/28/2012 7:03:09 AM
OP, you have a pretty serious headspace issue. The case is stretched badly. Just compare the shoulder to the other 2 Take it to a gunsmith or at least look into the fixes the other guys have suggested.
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Posted: 5/5/2012 3:37:43 AM
[Last Edit: 5/5/2012 3:38:50 AM by BravoSD6]
Originally Posted By POLYTHENEPAM:
[quote] The problem has exactly NOTHING to do with the steel case. The rifle was designed by the Soviets to use steel cased M43 cartridges. The tens of millions of steel cased cartridges have been fired through Chinese made SKSs by American shooters since the 1980s. Many times that have been fired through millions of SKSs in other countries before that time and since then. Firing a brass cases cartridge through the rifle in question poses an even greater ris of a catastrophic case failure than firing a steel case (which should not be attempted). Are you volunteering your face and eyes as a test bed? If not, I suggest you learn more and make fewer ill informed posts which encourage people to do things which could injure them. Dude! He's not bull-hiting. DO NOT FIRE YOUR RIFLE. You need to have it looked at by someone who is knowledgeable with SKSs. I had this same crap happen to me and I kept doing what your doing, trial and error, problem solving until the rifle finally exploded into pieces. I was slightly injured. Please be smart about this man. It is a head space issue and can possibly be more than that now that you have forced the rifle to work under the conditions its in. You will save time, money and bodily harm by just taking it to a gunsmith who is very keen to SKS's. Believe me I'm a total DIYer and this is not one of those ones you want to take a risk on. Play it safe or keep it on a shelf. That or sell it to someone you really don't like |
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Posted: 6/2/2012 11:47:23 PM
[Last Edit: 6/2/2012 11:53:47 PM by KYVENOM]
Originally Posted By yadayada:
Doesn't look good. Compare the shoulder height and shape between the two. Improperly manufactured ammo can cause problems if the shell doesn't seat correctly. The length from the bottom of the shoulder to the rim will be incorrect, resulting in splits, bulging cases and possibly damage to the gun and YOU. Ditch the steel crap. Steel is sheap for a reason. I don't understand why some spend good $$ on a gun and run crappy steel ammo through it. Try quality BRASS ammo, and see if any problems arise. BTW, several firearms manufacturers void their warranty if steel ammo is used. Why? Simple. 99.99% of the 7.62X39 guns in this world run steel. The SKS came after the AK. It came into this world firing steel. Oh, and check the warranty on that SKS. See if steel voids that warranty. Oh, there is no warranty? Well then. |
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