How to fix pitted chamber that imprint bump on brass

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Martinphunter

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Any suggestion to fix a pitted chamber that imprint bump on brass. It's tiny but make the extraction difficult. It' a high end precision rifle with chrome-moly barrel.

A mistake in cleaning procedure repeated over a long period created this rust pitt on 2 or 3 spots. The biggest is 2 thousand high x 85 thousand length x 35 thou wide. ??

The barrel has 800 shots, I would like to keep it for a while. I thought about devcon and release agent on a brass ?? Any Idea how to fix this ?? Any smith suggestion?
 
There are a couple of options, other than taking off the barrel, setting back the shoulder and reaming a new chamber, however, this would be the best option.

The other option is to get the chamber reamed enough to clean up the pits and fire form your brass to the slightly enlarged chamber. Not my first choice but cheap.

You don't mention if you hand load or are using factory loads.

If you're using factory loads, get the tenon shoulder set back one thread, depending on whether it needs to be indexed for whatever reason and ream a new chamber.

TWO THOU isn't usually enough to cause extraction issues. I've seen chambers reamed with dull flutes that leave deeper machining marks than that and they extract easily, even with straight sidewall cases, such as 45-70
 
Verified w/a bore scope-

Hone the corrosion out w/a nylon brush/patch & solvent.
Check the bore also.

Hone the chamber w/ a fired piece of brass w/ lapping compound.

If, the bore shows signs of corrosion,your Bbl is not precision anymore....but will still shoot.

If,the bore is serviceable,as mentioned the Bbl could be set back & re-chambered...for piece of mind.
 
What cartridge is this?

The best way to fix this is to set the barrel back some... enough so when the new chamber is cut the blemish is removed.

Have a gunsmith look at it and give you a quote.
 
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I second the suggestion to recut the chamber. Moving the throat forward gives you a chance to improve the leade so you might get better accuracy while you are at it.

As for improper cleaning, well, consider this your lesson-learned technique.
 
The rifle is a Sako TRG-22 in 308 win, I'm not sure if there is enough room to ream forward so barrel stay safe. At this point I rather put a new barrel, reaming and setting back will cost around 600$ I guess, it may be better to throw another 600$ for a new barrel. In my area the gunsmith have very long production time. The bore has minor pitting and is in good shape. Still shoot my handload very well, below 1/2 inch. I had the habit to neutralise my cleaning agent, and thought I was still protected by patch-out rust proofing agent. Did the mistake to store for winter dirty with kroil only in the bore because you don't oil the chamber for safety… Learning. I’ searching to a cheaper way to repair this. I’m searching to a cheaper way to repair this. The case are extracting, but the bolt is sticking when pulling back.
 
Martinphunter said:
The rifle is a Sako TRG-22 in 308 win, I'm not sure if there is enough room to ream forward so barrel stay safe. At this point I rather put a new barrel, reaming and setting back will cost around 600$ I guess, it may be better to throw another 600$ for a new barrel. In my area the gunsmith have very long production time. The bore has minor pitting and is in good shape. Still shoot my handload very well, below 1/2 inch. I had the habit to neutralise my cleaning agent, and thought I was still protected by patch-out rust proofing agent. Did the mistake to store for winter dirty with kroil only in the bore because you don't oil the chamber for safety… Learning. I’ searching to a cheaper way to repair this. I’m searching to a cheaper way to repair this. The case are extracting, but the bolt is sticking when pulling back.
Click to expand...

If you're paying more than $200 maximum, go to another smith.

That barrel will easily handle a set back. If push comes to shove, it might actually be a good thing all the way around.

A set back of one or even a partial turn, will not only clean up the chamber but clean up your throat/leade to almost new condition, extending the usable life of that barrel by at least 750-1000 rounds, depending on your loads. Cleaning up the nitriting of the throat/leade is always a good thing.
 
I think $600 for a set back is extremely high.

The .308 Win case does not have a lot of taper and the chamber dimension are unknown so I am guessing it may have to be set back as much as 1/2 inch to clean up what's there... many smiths would do that for $200 or less. To keep the costs down all the smith wants to see is a barrelled action and bolt...
 
Gunco in Ottawa does this type of work . First, you should ask around in your local area, to see if there is someone who is competent to polish the chamber.
and give that a try.
 
Gunco is not to far. The good smith I know have very long delay. The promise 3 month and it end up at 6-12 month. I will call gunco.

Any other suggestions?
 
I’m not a gunsmith, and while I avoid bubba sometimes you gotta do what you gotta do.
I had a similar albeit much worse problem on an old 38/55 Win ‘94.
The chamber had a deeper flake come off and to extract the spent case (I got it with one in it) a rod was required every time.
It was an old gun and I had no intent to buy a new barrel, nor did I want to lose the matching patina a 110+ years put on it.
I also never intended to put any amount of rounds through it, but I did want it to be a functioning rifle even if I consider it a wall hanger.
So my remedy was to clean the living ____ out of it and fill it with a high pressure epoxy (I can’t remember exactly which it was).
I bought a finish reamer and cleaned up the chamber after leaving it for quite awhile to cure.
The first trip to the range was entertaining, and at the end of the day it not only worked but has hung in there for a few years now.
I’ve got many be 30-40 rounds with it in and it doesn’t show any signs of degradation, when I posted this then another guy said he had a 303 which had it done years ago with no issues but I don’t know his round count.
I wouldn’t consider it on a gun I intend to shoot in volume that has an easily replaceable barrel but for my purposes it worked.
 
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