I do believe you said the magic words: "mostly hand loads".
They were quite likely just a bid oversize and slightly belled perhaps, or at least the ones that didn't feed well.
Polishing surely didn't hurt, except the chamber is no longer "original"; should that make any difference.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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