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It's a "standard" problem... with barrels that have a "match" chamber... I have the same issue with my GM's. (the tip of the bullet is pushed into the rifling)
Changing the extrator helps a bit... firing the shot works all the time
My Dlask did the same thing, would not extract any unfired rounds. Spent rounds extracted ok thou I have since put a VQ extractor and it extracts unfired rounds now.