Gents,
So I was thinking...

I recently have been recording (more casually than scientifically) that my groups with more run out are not as accurate as one's with less, which makes sense to everyone.

So I have this Hornady concentricity tool that not only checks run out, but allows you to adjust the run out favorably. The tool works well, as I stated, for checking and recording run out but my confidence wanes when it comes to pushing a seated bullet and it not somehow affect (or is it effect?) neck tension or god knows what other variable that I may or may not have ever heard of.

My thinking is that if I use the tool to get my run out to zero and then use my Lee crimp die, be it light, heavy or somewhere in between, then perhaps I could mitigate any neck tension concerns that might arise in the aforementioned. Although who knows, maybe the crimp die may affect run out too.(DOH!)

Just so you know:
Have not used Hornady tool as of yet for run out correction.
Use Forster ultra micrometer seating die.
Run out is usually between .001 and .002

Thoughts?