retrosub,
My handis don't like a crimp, at least with the accurate loads I got. If I give them even a light crimp the group opens up. I don't plan on going in the field with more than just a few shells, and I can carry those so they won't be abused.
That being said, you'll have too experiment, and you don't need the Lee Factory crimp die to do it, you can crimp with the seating die, just re-read the instructions.
The lee factrory crimp gives it a really tight "factory" type crimp, something that can take the beating of auto loaders and slaming around in a magazine. With the seating die YOU get to adjust how much crimp you want.