C no 7 question

[KC 53]

Hi guys, I recently purchased a c no 7. I took it to the range today and when I fired it the extractor pops a hole in the fired brass. I would assume this isn't normal and was wondering how to go about fixing this problem, the bolt is matched to the rifle and it appears to have been used very little.

Information

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[Thunderbox]

Is the hole made during firing, or when the case is extracted?

If the rifle is in mint condition, it might just be a very strong extractor spring coupled with a sharp unused extractor claw that is tearing the thin brass cases. These rifles were built to fire tens of thousands of rounds, and they probably take a long time to wear in using RF ammo.

[KC 53]

The hole is made when it is fired

[muffett.2008]

Can you post pic's of a damaged case rim?

[trooper554877]

gday muff,
back in the land of the living.
ready to begin the game!!
Cheers
Ned

[KC 53]

I tried the gun again with more rounds lastnight and its not the extractor making the holes, the cases are bursting when its fired and they are bursting out where the extractor fits into the receiver. I tried some different ammo and the problem became intermitent but the cases that didnt rupture would still have buldges in them.

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[Steve H. in N.Y.]

Could the extractor cutout be too far down into the chamber? It normally begins just at the edge of the rim area and the straight part of the chamber is not altered.

[browningautorifle]

extractor cutout be too far down

It does look like a failure to support the case. Normally something seen in race guns like .40 or .45 ACP...that would make sence.

[muffett.2008]

I agree, it looks like the edge of the chamber at the extractor recess is either broken or chipped.
Two solutions jump to mind, both requiring barrel removal.
You can repair the damage with braze, or shorten the barrel by 1 turn and recut the extractor slot and recut the chamber, the first option is not for anything other than .22's.

You might be smart to just check the headspace on the old girl, this happens a bit with old single shot rifles, so this could have some bearing on your problem.
Worth a look anyway.

[Patrick Chadwick]

You can repair the damage with braze, or shorten the barrel by 1 turn and recut the extractor slot and recut the chamber, the first option is not for anything other than .22's.

Wouldn't it be easier - and a lot cheaper - to add some metal to the extractor? Or, since they are probably hard to come by, cut out a replacement extractor? That would be simple metalwork, not gunsmithing.