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Old 03-10-2008, 08:03 AM
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Join Date: Dec 2007
Location: Austin, TX
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Mosin-Nagant chamber cleaning

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I have a 91/30 and want to avoid the sticky bolt syndrome. I have a .45 cal brush which I figure should work/fit best in the chamber. My question is on the proper technique so as a don't damage the rifle. I have seen some posts about using the brush in combination with a drill, but is that really necessary? Any and all tips would be appreciated.
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Old 03-10-2008, 09:12 AM
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Join Date: Aug 2005
Location: SC
Posts: 3,265
A sticky bolt is caused by one of three things, generally speaking -- ammo that's loaded too hot, a headspace problem, or dried out cosmoline commonly found in chambers and bores of old milsurp rifles. This last cause is the one you can correct with cleaning, and will likely never recur once you've gotten the chamber thoroughly clean.

Using the drill will hurt nothing assuming you use a bronze-bristle brush, and will speed things up considerably. I'd also recommend using something like GunScrubber first, which will melt away old cosmoline very rapidly. Using the little nozzle tube that comes with it will allow you to get into the locking lug recesses, which is the toughest area to clean out.
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Old 03-13-2008, 03:54 PM
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Join Date: Jun 2007
Location: Socialist Repugnik of Kalifornik
Posts: 61
Sticky chamber

Another thing you might check on the 91/30 chambers is burrs in/around the extractor groove in the 1-4 oclock position at the chamber/rim junction. Many 91/30's have a significant burr closing down the chamber diameter at the base of the cartridge rim area from the extractor banging against the back of barrel. most cartridges will chamber ok but upon firing expand and the burr will leave drag marks on the brass.
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Old 03-13-2008, 06:00 PM
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Join Date: Aug 2005
Location: Sugar Land, TX
Posts: 1,244
How do you fix this problem with a burr?
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Old 03-14-2008, 09:24 PM
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Join Date: Jul 2004
Location: Rolla Missouri
Posts: 858
Hold on.......some of these rifles have a chromed bore.....what you likely have is built up crud......try this first.....put simple green in boiling water...I use a fish cooker and a coffee can....remove the bolt......insert your cleaning rod till it sticks out of the muzzle.....afix a proper fitting the muzzle into the boiling water and soap mixture....pull the cleaning rod up to bring up the boiling water into the bore and this 20 or 25 times......lots of crud will come out and color the water....pour it out

do the whole thing over again....

then....coat the rifle with a light coat of oil.......wipe it till the metal is dry.....then go to the range and try i again....chances are the problem will have resolved be sure...get a dry marker
and color a case neck and shoulder with the the weapon and catch the extracted round in a folded towel....look for bright cut marks.....if you have them..then.....

go to the auto parts store and get some Clover brand valve lapping compound. Use the cartridge case as a guide....coat it with the coarse compound first ...turn the case by hand only.....I put a screw in a dowell, knock out the primer....screw it in and twist away....follow this with 7-10 reps with the fine grade paste.....then follow it up with an oversized patch coated with MAAS (WalMart polish in the household section 2.95 or so) sure to clean the chamber with the hot soapy water once again after doing this....If this process doesn;t solve the it or rebarrel.....m

Last edited by mtmrolla; 03-14-2008 at 09:28 PM.
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Old 03-15-2008, 03:01 AM
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Join Date: Apr 2001
Location: S.C.
Posts: 4,168
All those answers for cleaning are great. I would like to add that if your rifle was ever packed away in cosmoline and you found hardened cosmoline on your rifle, there should have been a real good cleaning with a solvent to start with. If your stock was not soaked and stained with cosmo then you are probably OK. Mine was a junk rifle to start with and then put away for a long time in cosmo without being cleaned. Oven cleaner had to be used on the stock and repeated washings to remove crud from the barrel have proved to provide little help with accuracy. The bolt is pristine and headspace is perfect. I think the bore is just ruined but it still puts bullets safely down range.

If you have not dissassembled and cleaned the bolt, you may want to do that. There are good instructions on the Mosine web sites. Scrubbing with warm soapy water should clen whatever is in your chamber if anything except a broken case neck.

If you don't have a sticky bolt now and you do regular cleaning I don't see you having a sticky bolt in the future.
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