Some dies sets let total reloading with three dies. Others may well require a fourth die with the taper crimp. Taper crimping, as opposed to roll crimping, must constantly be carried out Along with the 9mm. "Once fired brass" can be an marketplace time period that describes employed brass cases. https://9mmcase18528.blazingblog.com/37613048/the-smart-trick-of-9mm-reloader-that-nobody-is-discussing