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Case sticking in the chamber

1891, 91/30, M38, M44, 91/59, P-series, M27, M28, M28-30 and M39
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checkmate19
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Case sticking in the chamber

#1 Post by checkmate19 » Wed Jul 12, 2017 11:06 pm

I took my Finnish M39 and M44 to the range this eve and I enjoyed how they shoot . They are very accurate and the Fin has a very nice trigger pull. The two started having sticky cases after 10 of 15 rounds. I am giving the chambers a and bolts a better cleaning tonight and will see if that helps. I was using the ammo that was in the cases I picked up. I run them through a tumbler and they seemed to clean pretty well. I guess trial and error in in order here .
I am starting to really like the Rasheed . The sights on all of these are hard on my eyes but I seem to shoot ok with them.
I rarely got out to the range until a indoor range opened about 20 min away and allows rifles. I paid 250 for a years membership and shoot as much as I like for free. It has been fun shooting all the rifles that have been sitting for years.

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Re: Case sticking in the chamber

#2 Post by Rapidrob » Thu Jul 13, 2017 10:09 am

Always load your rifles from the magazine. Never drop a round in and close the bolt. Doing so will bend the extractor and cause "stiff bolt" opening. I did an article on this years ago and showed what happens causing the problem.
also,
There are several lots of BAD ammo out there. The cases are sub-standard and will cause a stiff bolt on opening. What ammo are you using?
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Re: Case sticking in the chamber

#3 Post by checkmate19 » Sun Sep 24, 2017 5:42 pm

Thanks for the advice Rob , I give the rifles a good cleaning and tried again today. I am loading from the mag. I think the chambers are still a bit dirty , dried cosmo and such. I brought a M44 that I have had for years that is like new and it shoot flawlessly. My tow an M44 and a Finnish rifle were giving me trouble. I only had a few rounds give me trouble today with just a little sticky bolt. I am going to give them a better cleaning again and try a shot gun brush in the chamber. They are nice shooting and fun to shoot and I look forward to getting them working better.

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Re: Case sticking in the chamber

#4 Post by checkmate19 » Sun Sep 24, 2017 5:49 pm

<a href=""><img src="https://i.imgur.com/YUkh3je.jpg" title="source: imgur.com" /></a>

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Re: Case sticking in the chamber

#5 Post by checkmate19 » Sun Sep 24, 2017 5:50 pm

This is the ammo I was using.
<a href=""><img src="https://i.imgur.com/YUkh3je.jpg" title="source: imgur.com" /></a>

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Re: Case sticking in the chamber

#6 Post by 72 usmc » Mon Sep 25, 2017 9:21 am

Some Mosins like the thicker rim ammo and some like the thinner rim ammo. Try both types. Yours is the thinner rim type. Be sure the chamber is polished mirror bright and then be sure you fine tuned the bolt and polished the correct contact spots . Look up "sticky bolt" or see this https://www.youtube.com/watch?v=QLL20Oh4P8M

I would say a common cause is dried, rock hard cosmoline in/on the chamber area and sides and give special attention to the locking lug area. Some chambers have pitted surfaces. You might see pock marks on the surface of a fired case that makes it hard to extract.The expanded cartridge kind of sticks to the walls uneven pits. Clean the chamber with a 20 gauge brush in a drill, use it to polish out the chamber. Rock hard cosmo gets soft with gas, soak the receiver action in a can of gas for 3 -5 days. Then clean it. You may have to polish out the chamber with a grit compound ( very fine grinding compound and oil) if its really rust pitted. If the chamber looks great then :arrow: Try different ammo types with different rim thickness. Shellacked ammo may melt and gum up a clean chamber. And fine tune the bolt, polish, grease, and set for the correct firing pin protursion.

But first try different ammo brands.
Last edited by 72 usmc on Mon Sep 25, 2017 9:06 pm, edited 1 time in total.
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Re: Case sticking in the chamber

#7 Post by 72 usmc » Mon Sep 25, 2017 8:57 pm

Here are view of 3 different kinds of head profiles and rim thickness on each is a wee bit different. So different ammo has slightly different profiles and some of my Mosins work smooth with thin Albanian or Chinese brass others like the thicker stuff. But use a well greased bolt, Russian rifles like grease. And read up on bedding the original way like the Finn Mosins and how to polish and smooth bolt operation. You may also want to fine tune the trigger.
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Re: Case sticking in the chamber

#8 Post by 72 usmc » Mon Sep 25, 2017 9:13 pm

Last edited by 72 usmc on Tue Sep 26, 2017 10:04 am, edited 1 time in total.
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Re: Case sticking in the chamber

#9 Post by ffuries » Mon Sep 25, 2017 10:09 pm

I use transmission fluid on my bolts and their operation is smooth as silk. A proper cleaning of the bolt and chamber and oiled with transmission fluid and I have never had a sticking case.
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Re: Case sticking in the chamber

#10 Post by checkmate19 » Wed Sep 27, 2017 6:35 pm

Thanks for the good info, I disassembled the bolt on the Finnish rifle last night . It was pretty dirty inside with dried cosmo. I smoothed the surfaces somewhat and will test fire again soon. This may have been the problem rather than the ammo as I suspected. The bolt feels smoother but tighter, not sure about that but it functions correctly. I will update after test fire at range. Thanks

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