When you set it up you screwed the die body too far down, the bullet got crimped by the die body before you'd reached seating depth, and then the seating stem pushed the whole works down. Cases are now garbage when they've been folded like that, most likely wouldn't chamber anyway. If you are worried about neck tension, use a smaller expander button in the sizing die to increase tension, or a separate mandrel to expand. Crimps are for bigbore size cartridges and straight walls, not needed for that cartridge. Far easier ways to do it other than crimping.
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