On 9mm, I think a huge number of people set their dies so that they expand the mouth just enough to get the bullet to seat without "shaving" the sides, then set their seater or crimp die to JUST take out the expansion. (so that the brass comes back to fit snug on the bullet at the mouth)
I bought EVERY Lee crimper die and tried them, and all they did for me was scuff up the mouth of the brass, so I quit, and just adjusted my lee seater so that it JUST touches the mouth, and smoothes it back to the bullet. You will see a tiny (<1mm) band of bright brass, right at the mouth, when it is set that way.
You can turn the die down toward the brass until you feel it hit the mouth to get a feeling for where it should be, and then fine tune. Sierra manual recommends AGAINST what I am doing, but it sure works fine. I've done hundreds and hundreds of 9mm this way, and I bet I am just a piker. I quit worrying so much about the crimp stuff immediately.
I am using Berry's 124 grain plated bullets for the above. I can't speak for other projectiles, but it has worked well for the Berry's. I only need three dies: full length resize, expand/charge, bullet seat/crimp. Also, I finally went to the lee turret press (4 holer, with auto index) for pistol ammo (still do rifle on single stage press) -- wow, what a nice press.
Have fun and stay safe!