Is it tearing up your cases? Can you measure your fired case and smoke a new case and cycle it to see if it's a interference issue. If you pull the bolt and push the extractor twards the bolt edge with a small screwdriver, it should move.....but with resistance. While you're at it, push the ejector to ensure its not seized up too.
You should be able to blast any debris from the extractor groove with carb cleaner and compressed air.