My seating die wasn’t right

I think everyone here has done that. I hadn't reloaded for rifle in ten or twelve years and the first time I set up rifle dies - Oops.

On the off chance you haven't already figured it out, your dies are trying to taper crimp while the bullet is still seating deeper. At some point the crimp is so tight, the neck rides down with the bullet as it seats deeper.
 
you sure it wasn't a plugged vent hole? I've done that when the lee paste lube clogged the vent before. But yeah, some force was involved.
 
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