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Yes, I got annoyed with the one I sporterised from a Syrian m48a with a buggered barrel - the extractor spring tension was making the bolt a dog and the click of the thing springing over the cases...

That thought crossed my mind too, unusual that it's only the odd-side rounds...

Have you tried a bit of a gentle tug to reverse the squash on it? If you're gentle about it the springs tend to pick up a bit more life and start doing their job again - for a while. Might get you...