Mosin Nagant and dinged brass

[Blanco]

I have a 43 Nagant that I picked up for next to nothing.
This gun had been pretty severely abused. Someone had TRIED to sporterize it. Truly a Bubba job!
The short story is that I did what I could. Added an ATI stock and a decent scope. It looks more presentable, and is a blast to shoot.
Not fantastic accuracy but passable.
Here is the problem ... After every shot I seem to be getting a ding in the shoulder of every case about a 1/4" long line.
The last time I had it out shooting after about 10 rounds I got a stuck case. Obviously an issue but not sure what might be happening ?
Just wondering if I am overlooking something obvious? What say the experts?

[NY_Treeguy]

Clint,

Check to see that the ejector is moving freely. Sounds like the action is still crudded up with cosmo. Could also be cosmo in the chamber. Shoot 5 or 10 to warm it up and scrub it out. Clean the chamber with copper wool on a brush.

Good luck.

[Garyshome]

I had something like that in a type 53, there was a burr in the chamber.

[725]

Ding / burr in the chamber was my first thought, too.

[nagantguy]

Also had a type 53 with a burr in the chamber, most likely I'm my humble.opinion is dirty ;crud, Cosmo. Causing stiff extraction.

[Blanco]

some pictures
The bolt is a bit different now it is more of a spoon handle shape.
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