lee undersized sizing die 9mm

Hockey7711 said:

I do use the crimp die with the 9mm. It applies a taper crimp, I believe. Should I try adjusting the die for a heavier crimp?

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Zendude said:

I had an issue with neck tension on a 3 of my 9mm reloads this past weekend. Two were S&B and the other was CBC. The bullets didn’t set back but rather pulled out of the case.
I use Lee dies, and one bothersome comment in this thread is whether the Lee sizing die sizes the full length of the case. I don’t understand how it would work at all if it did not size the entire case, only sizing the base of the brass near the rim instead. It doesn’t seem that a crimp die would be appropriate for resizing the case mouth and proper neck tension would never really be achieved.

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Tcruse said:

The undersize Lee sizing die is what you need to resolve your issue. Also suggest using a U (or M) expander die to insure that plated/coated bullets are not damaged during the seating process. There is no need to use a crimp die, they just usually just deform the bullet and increase the bullet setback problems.

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