Help with chambering a round

[markp]

I have an old cz brno in 8x57 which worked fine at one time. Then after sitting unfired for ten or more years i tryed to use it
and the bolt would not close over the rim of the cartridge .  I also bought a mosin nagant in 7.61x51 and this old gun
has the same problem . The bolt wont close over the rim of a case .  I can take the bolt out and put  a round under
the bolt ejector or whatever  the part is called and then put the bolt in the gun and shoot it like a single shot.

why does this happen and more importantly is there anything I can do to make these guns work without
taking them to a gun smith. 

[Frank46]

Not really familiar with your CZ but I'm guessing its quite similar to the 98 mauser. Cartridges are meant to be fed from the magazine and not put into the chamber then close the bolt. If it has a 98 mauser extractor then it has to be modified to allow the lip of the extractor to slip over the cartridge rim. The moisin needs to have the bolt worked with some force when you have a cartridge in the chamber. I've see guys literally slap the bolt down on a moisin when chambering a cartridge. Hope this helps. Frank

[keith44]

From memory from 20+ years ago, the Mosin has a heavy and wide extractor, that does require some serious force to operate, However this is also prone to freezing with corrosion.  Soak the entire bolt assy in a container of Kroil or other QUALITY penetrating oil.  (WD 40 will not work).  Soak and try, soak and try for a few days. 

[markp]

Frank46  thanks for your help.............when cartridges are stripped from the magazine they chamber flawlessly in the CZ  brno .
I would never have thought of this.

Keith44 thanks for your help as well...the mosin is still having issues...I may try the penetrating oil on this one. 

[Frank46]

Glad to have saved you some $$$ and anguish. Keith44 also has a good idea. Soak it in a good penetrating oil for awhile. Don't remember which movie (Dr Zivago or Enemy at the Gates) but there is a scene where the russian soldier literally slaps the bolt closed and slaps it open. Hope all works out for you. Frank

[gunnut69]

If single loading the cz wrap the left hand around the action and apply pressure with the finger to the tail of the extractor midway between the collar and the rear receiver ring. This will allow the extractor to jump the rim of a single loaded round.. Many, MANY extractors have been ruined trying  to modify them to jump the rim on a single loaded round, it will not work.... use the rifle as designed..

[keith44]

Good luck with it markp, hope you do not need a major re-do via gunsmith (hourly rates are what they are worth, and prices can out strip the guns value fairly quickly)


Gunnut69 has a good point, forcing the extractor to jump the rim instead of having the rim slide up under the extractor can cause undue stress on the extractor and extractor spring, and pivot pin

[gunnut69]

The 98 mauser (cz) has no pivot pin..and the tail or rear of the extractor is the spring.. The problem with a controled round feed is that the round is supposed to load under total control from the magazine, not single loaded. If one grinds the blade of the extractor to allow it to snap over the cartridge rim it will no longer function as an extractor. If you remove the spring tension off of the extractor the single loaded round will snap right in..