Lee collet dies are fantastic. It cut the runout from my bushing neck sizing dies in halfI take it you guys are referring to using the Lee collet dies? Since I do not currently own a custom set of dies, I always try and use a body die followed by an expand mandrel to set the desired neck tension: I cringe at the thought of pulling the expander ball back through the case neck.
However, I would be open to giving the collet die a try.
Thanks