On new brass I use a Sinclair Carbide Neck Expander Mandrel, and that is it.
I remove the expander balls from my Redding dies and never use them in sizing my brass.
I'm sure that works, just an extra step to size then expand...
Set up right, the Lee Collet neck sizer does pretty close the same thing with one easy step.
Only Lee down side is an occasional body die that you won't need with your system. But, that step isn't needed every time.
DF
