Originally Posted by
willie
I suggest resizing the case in a 38/357 die first. I then used a steel 9mm size die which was tapered like the 9mm case. A sized case would enter far enough to reduce mouth diameter. I'm not certain that a 9mm carbide die would work-- no taper in carbide ring. I got by without expanding case mouth since I was using a jacketed bullet.
With proper adjusting the op can use the Lee Collet Die to reduce case mouth diameter slightly before seating bullet. Then use it to crimp. Now that I think about, I recommend buying the collet die which can do both--size mouth and crimp. Factory crimp die won't size mouth(slightly too big). We are making stuff do different jobs here. Collet die will work for both.
The op can make this work but the effort may be a cumbersome endeavor and may or may not produce accurate ammo.