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The spring pressure? Normal expanders are solid and if using the Lee powder through die (with spring return) one goes past/beyond the actual spring throw to flare and charge the case.You don't mention it, but if you are using a powder thru the expander type setup, the spring pressure applied to the case mouth/end could be enough to bulge a case that is soft, thin, or both.
I have found that spring on a Lee rotary powder measure to be quite firm.
just sayin'
Not really understanding what you're trying to say.