Some dies sets make it possible for complete reloading with 3 dies. Many others may perhaps require a fourth die for the taper crimp. Taper crimping, in place of roll crimping, really should normally be finished Together with the 9mm. There was a big dialogue on here a long time https://9mm-reloading52963.onzeblog.com/38157512/9mm-bullet-reloading-options