You should use taper crimp and not roll crimp for semi-auto rounds that headspace on case mouths. If you look at the finished round on the left, you can see the bullet actually indented significantly (I wonder what the OD measurement is at that point?) and certainly this reduced diameter will likely allow the case mouth to be inserted into the leade/freebore of the barrel instead of case mouth headspacing on the chamber - not a good thing.matworz said:The Hornady Custom Grade New Dimension Nitride 3-Die Set is a great die set for the avid reloader. The set includes ... CGND Seater Die with roll crimp." Does anyone know why they even make a roll crimp for 9x19?
Back the die up in the lock ring so no crimping is going on. then seat some bullets (to the proper depth). then back the seater stem way up so it will not touch the bullets and slowly screw the die body back down so the crimp ledge barely touches the case and just removes the bell.