Some dies sets allow for complete reloading with 3 dies. Other individuals may demand a fourth die to the taper crimp. Taper crimping, instead of roll crimping, really should usually be performed with the 9mm. The beneath photos and knowledge are from a brilliant in-depth submit from Blessed Gunner in https://9mm-bullet-reloading96282.tkzblog.com/37775641/9mm-reloading-bullets-things-to-know-before-you-buy