Winchester M54 270 Case Problem

[NineMilePete]

I will try to post a couple pictures of my recently fired 270 cartridges.
As you can see, there is a ring just back of the shoulder apex.
Question: Would this be cause by a so called "ringed" chamber?
I bought the gun used a couple of years ago.
I can chamber and fire factory 270 cartridges Ok in my M54, but cases fired from my Husqvarna that I've resized, are very difficult to impossible to chamber in my M54.

Discussions are avidly requested.

 

[rcmodel]

Did you clean it with steel wool on a tight bore brush in a drill as I suggested in your other thread about it on June 16?

http://www.thehighroad.org/showthread.php?p=8224482#post8224482

rc

 

[NineMilePete]

RCModel:
Not yet. Are you thinking that there was a case separation at one time in the chamber?
Now that I think about it, seems logical.
I will let you know.
thanks

 

[NineMilePete]

RC:
Tried your suggestion. Seemed to help. I can now chamber my resized cases, although still a bit tight.
thanks

 

[rcmodel]

If you still get the ring on fired brass?
There is something still in there.
Keep going with the drill and steel wool & solvent.

It may be hard carbon, rust, or a broken case.

But as I said in your other thread about it.
Winchester didn't put it there back then, whatever it is.

See if you can shine a light down in there and see any shiny brass ring in the chamber now that you cleaned on it some.

rc

 

[NineMilePete]

Looks like that solved my problem.

I'm still a bit curious though:

I've heard the term " ringed chamber" before. What exactly is meant by that?

thanks for your patience with my inane questions.

 

[rcmodel]

My interpretation of that would be a revolver chamber expanded due to high pressure.
The ring would be mid-length of the case and cause difficult extraction.

Or more likely, dating from pre-history, old .22 Long Rifle chambered guns shot with tons of corrosive primed black powder .22 Shorts and never properly cleaned.

That often left a corrosion pitting ring in the chamber where the .22 Short case ended that made extraction of the longer .22 Long Rifle case problematic at best.

Your .270 bottleneck chamber would not fit the conditions necessary to "ring" the chamber where your problem is.
If it was due to over-pressure, most likely the gun would have blown up from a case failure before the thickest part of the chamber expanded there.

And your fired cases show a depression on the brass, not an expansion.
So, it had to be something stuck in the chamber.

rc