I have ascertained the problem is the dies by using them in my D1050 tool head, then resizing various 9mm cases like a single stage push. I'm only using the press for resizing, and remove the resized cases as soon as the shell plate developments. There was an enormous dialogue https://reloading-9mm07417.post-blogs.com/57514974/9mm-casing-no-further-a-mystery