Originally Posted by Whttail_in_MT
Originally Posted by bruinruin
Originally Posted by ruffcutt
Pull the decapper pin on your resizing die when resizing, then reinstall and size neck on down stroke instead of up.

For some reason I'm having a hard time visualizing this. Can you explain further?

What he means is remove the expander ball for the sizing operation, then install and push the sized neck over the expander ball. Pushing instead of pulling over the ball can reduce runout but it is an extra step.

Some graphite on case necks makes things run a lot smoother

[Linked Image from i.imgur.com]