After a lot of testing with different dies, I've found I get the best concentricity from a Redding Body die and a Lee collet die to size the neck. The graduations on the dial gauge on the tester is .01mm (or .0004", 4/10ths of a thou).
6.5 Creedmoor Hornady case, 130gr Berger VLD seated with a Redding competition seating die.
It's a pretty good advertisement for the little Lyman Brass Smith press as well!
