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Burr on the chamber possibly? The steel would be hard enough to skate over that, but it would bite on the brass and foul up feeding. I would be curious if there are any indicative marks on the brass that could tell you exactly where the problem is. If it is a burr I bet it would hate poly coated stuff too.I have an SKS D? Thumbhole stock, Chinese import....
It absolutely hates commercial brass cased ammo, no issues with steel cased....
Sorry I can't help with poly cased...
Joe