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I'd guess it's had it's bolt brute-forced open over a stuck case in the chamber at some point. That would explain the chip out of the bolt rim.

Talk to Mike Shepherd at Westgate H&F he'll know...

Oh right, prob should get a smiths opinion on that then, might be able to machine it out and sleeve it. Julian has the extractors.
Gunsmithing &Reloading Tools - Remington Extractor - Rivetless '06...

The Remington clip type extractor. You should be able to get one locally, or you can get a good gunsmith to machine your bolt up and install an M16 or Sako type extractor.

You might have trouble...