I am using a LEE taper crimp die. While LEE claims seating dies made in recent years have the taper crimp, I still prefer to have a separate taper crimp only die at the end. I will disagree with LEE on their dies ability to over crimp, and I'm a big fan of theirs.
I use a factory round to set my dies with, but I reckon I must have tightened it down another bit last time. It made a serious difference in groups, especially with the powder coated lipstick bullets. I know that the 9mm does not need to be crimped, but I just need to reform the opening of the case mouth that was applied to accept projectile. My fault. I have only been reloading 9mm for a few years. I load quite a few .45LC, .44mag, .44spc and .38/357, all that need roll crimp as well as tons of .45ACP that my dies are "set for". So extra pressure when crimping is normal for me. I actually have a 45acp barrel that has a good cut away to check for proper fit. An old feller, who shot at places like Camp Perry gave it to me when he sold out. Yeah, I bought everything he had and his recipe works. The set screw on RCBS dies prevents getting the out of adjustment once adjusted.
My last test rounds were with 115gr powder coated 9mm and 95gr Federal soft points, using Unique vs. Bullseye.
Best loads were
115gr lead powder coated 4gr of Bullseye beat 6gr of Unique.
95gr SP shot better wth 5gr of Bullseye than 6gr of Unique.
All loads shot great groups but the Bull did better shooting from a very good sand bag rest @ 21 feet and all wth the same pistol. Target was a small sticky note perhaps 1 x 2 inches.
Very pleased wth the test rounds just some better than others.
For both bullet weights tested Bulleyse produced better groups good thing cause
thats it's a staple in my supply.
BTW the hard taper crimped rounds left over were fired they are the same bullets and powder charge as the light crimped, huge difference in grouping.