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Posted: 12/1/2012 5:35:34 PM EDT
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I just bought my wife a 1943 Russian Mosin and it has a small issue. When you push the bolt forward on a loaded round it goes all the way until the extractor has to snap over the rim and then the bolt takes a lot more effort to turn down as the extractor snaps over the rim.
I tried polishing the extractor so it would go over easier and it got a lot better. Could the extractor be hitting part of the barrel? It doesn't happen when the chamber is empty or once the extractor is already snapped over the rim. Has anyone heard of this issue? |
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Unluckily, as someone who has had extractor issues, technical help is hard to find. It may be best to simply replace the bolt head. And, check head space.
There are some reports that say polishing the rim and center of your bolt head, lightly, can help relieve the symptoms you describe. |
| It's a war time mosin, miss fitted parts and poor tolerances are their specialty. Other possibility would be your head space is off, in this case the Go probably would fail. Meaning the bolt is smashing the rim against the back of the barrel instead of holding it securely. First things first, use a chamber cleaning brush and make sure the groves where the bolt locks are clean, cosmoline and unburnt powder love to hide in there and mess with head space/locking, and if that don't help easiest fix in most cases is to just swap bolt faces until you find one that fits better. |
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It's a war time postwar rebuld mosin, miss fitted parts and poor tolerances are their specialty. Other possibility would be your head space is off, in this case the Go probably would fail. Meaning the bolt is smashing the rim against the back of the barrel instead of holding it securely. First things first, use a chamber cleaning brush and make sure the groves where the bolt locks are clean, cosmoline and unburnt powder love to hide in there and mess with head space/locking, and if that don't help easiest fix in most cases is to just swap bolt faces until you find one that fits better. Fixed.  Original wartime rifles are generally excellent in fit and function. It's the mixing of parts at refurb that leads to problems like this.
OP, there are three common causes for this issue. I'll start with the easiest to fix -- 1. Crud/debris in the chamber face cutout area, where the extractor has to be when flexing to snap over rim. This is easy to check and fix. 2. Thick rims on ammo. Most surplus ammo was made for com-bloc machineguns and rim thickness can vary widely. A rim that's too thick will cause this issue as you have to force the extractor over it. Try another kind of ammo, or snap a round under the extractor with the bolt removed (and FP/spring removed for safety). 3. Burr on underside of extractor. Sometimes over time, especially if used with thick-rimmed ammo, a burr can develop on the underside of the extractor, where the rim wants to be. You should be able to see it if it's present. Also an easy fix... sometimes doable without removing the extractor, sometimes you have to replace the extractor. Be careful reinstalling a new one as they can be a tight fit. Or you can do as suggested above and replace the whole bolt head, but then you have to check headspace. |
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Other possibility would be your head space is off, in this case the Go probably would fail. Meaning the bolt is smashing the rim against the back of the barrel instead of holding it securely. I had an M39 like this. Drove me nuts the first time at the range. I checked it with a Field gauge when I got it......and it passed with FLYING colors......too flying if you catch my drift. I couldn't chamber a round at all. Needless to say after trying a few times, I figured out what was going on, and after swapping a few bolt heads, I found one that headspaced loose enough to chamber a round, and tight enough to pass the Field gauge. |
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The rifle is new to me and was absolutely clean when the issue was noticed. With the bolt out of the rifle the rounds slide into the bolt easily.
The rim looks to have about 0.01" clearance in the bolt. The bolt has zero clearance issues when there is no round in the chamber and zero clearance issues with a round snapped into the bolt under the extractor. I am going to watch the extractor carefully to see of I can make out impacts on the breach face or if the whole issue is the extractor. I have polished the surface of the extractor that hits the case. I chamfered the outside sharp edge with a file. I will deburr the hook of the extractor just for fun. |
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The rifle is new to me and was absolutely clean when the issue was noticed. With the bolt out of the rifle the rounds slide into the bolt easily. The rim looks to have about 0.01" clearance in the bolt. The bolt has zero clearance issues when there is no round in the chamber and zero clearance issues with a round snapped into the bolt under the extractor. I am going to watch the extractor carefully to see of I can make out impacts on the breach face or if the whole issue is the extractor. I have polished the surface of the extractor that hits the case. I chamfered the outside sharp edge with a file. I will deburr the hook of the extractor just for fun. Then from my above post, it's most likely issue #1. This is not a particularly easy area to clean and it is very possible that some hardened crud is in there, interfering with the extractor movement. |
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The rifle is new to me and was absolutely clean when the issue was noticed. With the bolt out of the rifle the rounds slide into the bolt easily. The rim looks to have about 0.01" clearance in the bolt. The bolt has zero clearance issues when there is no round in the chamber and zero clearance issues with a round snapped into the bolt under the extractor. I am going to watch the extractor carefully to see of I can make out impacts on the breach face or if the whole issue is the extractor. I have polished the surface of the extractor that hits the case. I chamfered the outside sharp edge with a file. I will deburr the hook of the extractor just for fun. Then from my above post, it's most likely issue #1. This is not a particularly easy area to clean and it is very possible that some hardened crud is in there, interfering with the extractor movement. #1 is clean enough to eat off of if you don't mind a light coat of clp. I was actually checking the breach face cut for damage from the extractor hitting it. Nothing I can see so far. |
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The rifle is new to me and was absolutely clean when the issue was noticed. With the bolt out of the rifle the rounds slide into the bolt easily. The rim looks to have about 0.01" clearance in the bolt. The bolt has zero clearance issues when there is no round in the chamber and zero clearance issues with a round snapped into the bolt under the extractor. I am going to watch the extractor carefully to see of I can make out impacts on the breach face or if the whole issue is the extractor. I have polished the surface of the extractor that hits the case. I chamfered the outside sharp edge with a file. I will deburr the hook of the extractor just for fun. Then from my above post, it's most likely issue #1. This is not a particularly easy area to clean and it is very possible that some hardened crud is in there, interfering with the extractor movement. #1 is clean enough to eat off of if you don't mind a light coat of clp. I was actually checking the breach face cut for damage from the extractor hitting it. Nothing I can see so far. Okay, good... sorta. 
Have you tried another type of ammo? Could still be a rim thickness issue -- or just a bad fit between extractor angle and the chamfer often found on the bottom of the rim of comblock surplus 54r. |
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The rifle is new to me and was absolutely clean when the issue was noticed. With the bolt out of the rifle the rounds slide into the bolt easily. The rim looks to have about 0.01" clearance in the bolt. The bolt has zero clearance issues when there is no round in the chamber and zero clearance issues with a round snapped into the bolt under the extractor. I am going to watch the extractor carefully to see of I can make out impacts on the breach face or if the whole issue is the extractor. I have polished the surface of the extractor that hits the case. I chamfered the outside sharp edge with a file. I will deburr the hook of the extractor just for fun. Then from my above post, it's most likely issue #1. This is not a particularly easy area to clean and it is very possible that some hardened crud is in there, interfering with the extractor movement. #1 is clean enough to eat off of if you don't mind a light coat of clp. I was actually checking the breach face cut for damage from the extractor hitting it. Nothing I can see so far. Okay, good... sorta.
Have you tried another type of ammo? Could still be a rim thickness issue -- or just a bad fit between extractor angle and the chamfer often found on the bottom of the rim of comblock surplus 54r. I will play with it later. |
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You might try this - http://www.youtube.com/watch?v=PePjQrrPsbs
From some accounts, the rim on Bulgarian light ball can be a bit thick. |
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It's a war time postwar rebuld mosin, miss fitted parts and poor tolerances are their specialty. Other possibility would be your head space is off, in this case the Go probably would fail. Meaning the bolt is smashing the rim against the back of the barrel instead of holding it securely. First things first, use a chamber cleaning brush and make sure the groves where the bolt locks are clean, cosmoline and unburnt powder love to hide in there and mess with head space/locking, and if that don't help easiest fix in most cases is to just swap bolt faces until you find one that fits better. Fixed. Original wartime rifles are generally excellent in fit and function. It's the mixing of parts at refurb that leads to problems like this.
No I am going to stay with my previous statement. The mix and match of parts dose not help but over all war time components tend to have wider tolerances and less finish work then pre/post war components and because of this they fit together poorly. |
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It's a war time postwar rebuld mosin, miss fitted parts and poor tolerances are their specialty. Other possibility would be your head space is off, in this case the Go probably would fail. Meaning the bolt is smashing the rim against the back of the barrel instead of holding it securely. First things first, use a chamber cleaning brush and make sure the groves where the bolt locks are clean, cosmoline and unburnt powder love to hide in there and mess with head space/locking, and if that don't help easiest fix in most cases is to just swap bolt faces until you find one that fits better. Fixed. Original wartime rifles are generally excellent in fit and function. It's the mixing of parts at refurb that leads to problems like this.
No I am going to stay with my previous statement. The mix and match of parts dose not help but over all war time components tend to have wider tolerances and less finish work then pre/post war components and because of this they fit together poorly. My experience with original finish, original matching number rifles does not bear this out, though I will agree the finish work is of lower quality. Just not that reliability issues and bad parts fitment is normal or acceptable. These rifles, even the rough wartime ones, were reliable and assembled properly at the time of manufacture. |
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Check the case rims for scraping along the edges. I just fixed one of mine where the "lip" around the boltface had a burr on it and it was dragging around the edge of the case rim when chambering a round. THIS I've had this issue on a number of Mosins . Not only burrs but also the lip bent in at extractor cut. |
| My '33 hex Mosin does that. I replaced the extractor with a surplus extractor, did the .50 cent polish job, cleaned and re-cleaned the chamber, and guess what ? It still does the same thing. Some go in easy, some don't. The only thing I can think of is.....Hey ! it's a Mosin ! |
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My '33 hex Mosin does that. I replaced the extractor with a surplus extractor, did the .50 cent polish job, cleaned and re-cleaned the chamber, and guess what ? It still does the same thing. Some go in easy, some don't. The only thing I can think of is.....Hey ! it's a Mosin ! LOL! 
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