Clearly you mentioned that the spent case is "stove-piping" before complete ejection of the spent case. Correct?
That tells me that the extractor is letting go of the spent case prior to complete ejection of the empty case. And, I agree with you, It's not the nature of the firearm, it's a problem these rifles will have if the chamber is pitted, or the extractor is worn and fails.
Extractors are no longer available from Remington for the 740, or 742. To replace an extractor you would need a new extractor and extractor rivet, and it does help to have the fixture used to hold the bolt while the rivet is staked to hold the extractor in place, in the bolt face. So, it can be fixed.
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