Just purchased a RCBS Case Master. Perhaps a little fiddly to set up but I am sure that wil change with practise.

So far on a random selection of my reloads with used cases 222/25/06/7x57/308

Case neck run out, all very good mostly under 0.002"

Case Neck thickness, again very good mostly under 0.002"

Case head separation, excellent

Bullet run out, appalling often up to 0.01"

I use Hornady New Dimension/RCBS/LEE die so either I am ham fisted with bullet seating or my press a Wamadet is way out of alignment.

I will be undertaking more test next time I reload, what is your experience of this tool?