Originally Posted by wnroscoe
Two things reduced or eliminated the run out; one was not sizing the neck more than .005" at a time and the other was not using the expander ball. I know, no expander ball is a no brainer. Cases sized with the bushing die when the bushing was removed had .000" run out in the neck. When the bushing was re-introduced and sizing in the neck was more than .005", at least .002" to .003" run out was present.
I think the best way to remove as much run out as possible is to turn the necks for a 100% clean up only, use a FL Bushing Die with no expander and not size the neck more than .005" at a time, this means using two or more bushings in the sizing process.
Very beneficial input. I have some questions for completeness of the analysis:
1. Was the sizing stem straightened?
2. Was the expander ball polished?
3. Was the expander ball or sizing stem free-floated?
Glen Zediker has a philosophy that suggests not turning more than 50% of the neck circumference, primarily to prevent overly thinning of the brass that promotes excessive expansion in the chamber. Do you have any countering perspective that you could offer?
Thanks very much for sharing your experience. I agree with your approach.