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Have you checked your resized brass against a good case gauge? You really need to do that first thing. Sounds like the cases may have been MG fired in a really loose chanber and your resizing didn't push the shoulder quite all the way back into spec. Can you lower the sizing die down any more? Might take enough so that the ram is "camming over" when you resize.
I've reloaded many thousands of SBS cases and had no problems.
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