I use powdered graphite when I'm using 'standard' dies,a small amount on a case neck brush is ample,just make sure you tap off any excess.This won't contaminate powder or primers.
I also polish my expanders down to .002" smaller than bullet diameter.This amount of neck tension has worked for my 'standard' hunting rifles.
My long range/target rifles use very different processes to this,neck bushing dies etc.
[b]MagnumManiac[b]