You may want to check the neck thickness of the brass in addition to the expander. I run Redding dies almost exclusively in my single stage press both competition and Type S. I have replaced all the supplied expander plugs with the carbide balls that float since they generally produce more concentric necks.
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"Emergencies have always been the pretext on which the safeguards of individual liberty have been eroded" - F.A. Hayek
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