When you wrote this post I had just bought a Redding 2400 with the micrometer on it. something I had wanted on my old one. I have worked with is a couple of weeks and I like it. The mouths are square and you can repeart measurement perfictly at least so far. I used to have an RCBS and hated it for that reason. I will also recomend using Norma or Lapua brass. It hurts a little to buy it but it lasts alot longer and you can anneal it and get even more use out of it.