Hello, I have recently just got into reloading and purchased the sdb.  The press came with .45acp already installed and I successfully made around 500 bullets.  However, when I went to change from .45 to 9mm I am having some issues.  When the press goes to stage 2 (powder drop) it is expanding my case out immensely.  As I said, I am new and I have probably just did the changeover in-correctly.  I replaced toolhead, dies, and primer slide.  Do you have any advice as to what it could be?

Thanks,

Mike