I am not happy with the Hornady New Dimension dies at all. The expander is giving me a pain in the posterior with brass that is the same of uniform length. For every 3 cases expanded 2 are over expanding. If they would have had any other brand of dies on the shelf I would have bought them.
Oh and I am sure it is operator error so I will not bash a brand. More times than not it is my error that is causing the problems.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.