I ain't never had luck with bushing dies, Redding or otherwise. 3 thou runout is the best I can ever hope for on a good day. Lettering up, lettering down, die 1/8th turn loose, 1/4 turn loose, 1/2 turn loose. My Forster bushing dies are maybe better but not by a huge amount.

I get less runout sizing the entire case with a regular FL die (with no expander ball), then opening the neck back up with a mandrel, even though I'm moving the neck a lot.

But as Mathman and DYE7 said I've also landed on body sizing (either with body die or with bushing die, sans the bushing), then hitting it with the Lee Mandrel. That seems to give the lowest runout all day every day.

You can run your same die now without the bushing and drop $25 on a Lee collet die. You'll probably want to get the $5 undersized mandrel, too. Ie the whole setup costs the same as a single Redding TIN bushing.

Last edited by TX35W; 06/13/20.