Fix for chip in chamber

[3Ackleys]

A friend just had this barrel chambered. Shooting it today, he noticed marks on the shoulder of the brass. Looking at the chamber. There is what looks like an embedded chip in the shoulder of the chamber. What if anything can be done to fix it?

 

[Alguapo]

I had the same thing on A Savage 20 Practical build. I had my smith take a quarter inch off the chamber. I bought the reamer. He rechamber it. Worked fantastic.

 

[jds holler]

What cartridge? jd

 

[3Ackleys]

6 Sherman max i beleive

 

[Rat Rifle]

That happened to Me on a 6BRA barrel with most of the chips in the body area. I ran a drill bit into the primer hole of an old case, coated the case with Flitz, and spun it in the chamber until it polished smooth. The barrel shot some Match winnings.

 

[DaveTooley]

The simplest thing to do would be to go in with the reamer and turn it by hand to take off whatever is on the shoulder. That's assuming what we see is not an indentation in the barrel.

 

[gunsandgunsmithing]

Maybe I'm missing it but I don't see a chip and I have to wonder how one would happen there. Looks to me like a superficial mark of some kind and the magnification is making it look like more than it is. I'd pull the bbl and inspect it. Maybe chuck it up and give it a light polish with 320 or so on a dowel. I bet it goes away fast.

 

[SKWERLZ]

Maybe I'm missing it but I don't see a chip and I have to wonder how one would happen there. Looks to me like a superficial mark of some kind and the magnification is making it look like more than it is. I'd pull the bbl and inspect it. Maybe chuck it up and give it a light polish with 320 or so on a dowel. I bet it goes away fast.

^^^^^

 

[gunsandgunsmithing]

Does it show up on fired brass?

 

[3Ackleys]

Thank you all for your input.
The reason I believe it is a chip, is it leaves marks on the brass. I was chambered on a CNC. The guy has done quite a few chambers but isn't full time.

 

[Larry Koch]

It looks like its in the metal. I have had this happen where a small imperfection in the steel, just happens to be in the shoulder area on finishing the chamber.

 

[gunsandgunsmithing]

Thank you all for your input.
The reason I believe it is a chip, is it leaves marks on the brass. I was chambered on a CNC. The guy has done quite a few chambers but isn't full time.

Well, I stand corrected I suppose but those are definitely some strange looking marks and I still don't see anything in your chamber that resembles those marks being left on you brass. Of course, if the marks are dents in the brass rather than raised places, then something is raised in the chamber rather than chipped. Hell, I'm even more confused after seeing your brass. Lol! I assume all your cases have those same marks??

 

[3Ackleys]

Yes the dents are on all. I think he has fired 50 rounds on this barrel.

 

[gunsandgunsmithing]

Yes the dents are on all. I think he has fired 50 rounds on this barrel.

Both interesting and strange for sure. If ya had the reamer for it, ya might get the raised places out by just turning the reamer by hand just enough to remove the high spots or whatever is making the dents in the cases. Normally I'd say there's something in the chamber but those marks are weird and I got no sure answers as to how they got there or how the chamber got raised metal in that pattern. I'm curious how it turns out. Worst case is a setback though, more than likely.

 

[DaveTooley]

Thank you all for your input.
The reason I believe it is a chip, is it leaves marks on the brass. I was chambered on a CNC. The guy has done quite a few chambers but isn't full time.

That pic doesn't match what you show in the pic of the chamber. Curious

 

[Aero]

I can’t tell anything from either pics, but I’ve seen similar marks caused by the fired case being pushed hard by the ejector into a sharp or burred inside front edge of the ejection port or the top front edge of the lug raceway.

Just a thought

 

[Will Henry]

That looks like a gas cut from a split neck to me. It might clean up without increasing headspace too much. The mark shown on the brass is not from the chamber. WH

 

[tobnpr]

Yes the dents are on all.

Never seen this one before. First thought was possibly a miniscule chip out of a flute at the neck/shoulder junction of the reamer, but that would be cleaned up by the other flutes. No clue how that raised pattern in steel could be created by a rotating reamer. Can your borescope do right-angle imaging rather than straight-on? It should be obvious if you can get a right-angle view and spin the barrel around it at the shoulder.

 

[BuffaloBill]

I can’t tell anything from either pics, but I’ve seen similar marks caused by the fired case being pushed hard by the ejector into a sharp or burred inside front edge of the ejection port or the top front edge of the lug raceway.

Just a thought

I think you’re on to something. You can see a mark along the body, across the body/shoulder junction, then skipping down the shoulder.

 

[3Ackleys]

That looks like a gas cut from a split neck to me. It might clean up without increasing headspace too much. The mark shown on the brass is not from the chamber. WH

This rifle was chambered a few days ago. 50 new cases were fireformed in this chamber. There are no split necks, and the cases didn't have any marks on them before fireing.