Some dies sets let whole reloading with 3 dies. Other folks may possibly need a fourth die for that taper crimp. Taper crimping, in place of roll crimping, really should constantly be performed Together with the 9mm. The underneath pictures and facts are from an excellent in-depth put up from https://dallasiptyd.bloggactif.com/39462618/not-known-factual-statements-about-9mm-bullets-for-reloading