Once again, thanks for all the comments. They're helpful.
With respect to concentricity and the impact that inconsistent neck thickness has on it, I know that this is one of the reasons necks are often turned, especially when using a bushing neck sizing die. I'm wondering if using a Lee collet die, which would push the variation to the outside of the neck instead of the inside, eliminates both the need to turn the necks as well as any inconsistencies in concentricity resulting from inconsistencies in neck thickness (and thereby minimizing run-out). What do you think? I know Mathman is a big fan of the collet die.
