Quote:
case mouth is getting caught inside the expander ball, which pulls the zip spindle downward on the upstroke.
There is zero spent primer movement, so it's a safe bet that the decapping pin isn't even making contact,
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Okaaaaay....
First, the "pin" must extend from the expander ball by about 9/16" to ensure you don't have the expander ball portion bottom out in the case.
Second, the expander assembly should screwed into the die far enough that the
pin portion protrudes from the bottom of the die mouth by 5/16-3/8" (or so) to ensure the primer is cleanly punched out of the case.