Get a separate crimp die...

If you try to crimp *and* seat at the same time, a couple things happen. The bullet is being pushed down while the case is getting crimped. No matter how you do it, there at the end, the case is fully crimped and the bullet still has a touch to go. Sometimes the bottom of the case gets belled out if you have too much crimp. Or, you shave some copper off the bullet and these little rings of copper rolling around the inside of your pistol.

Add in variations in case length and you can get a lot of crimp, just enough, or not enough.

I like to crimp until I just leave a faint ring on a pulled bullet and I cant push the bullet any deeper with firm thumb pressure. Too much crimp and accuracy falls off, bigtime.

A good wag for 45ACP and 10mm is an OAL of 1.250 and 9x19 and 40 is 1.130.

I dont crimp rifle ammo, at all.

I tried the Lee FCD, but took them off my 1050s and 550s cause it made them too jerky and much less smooth. I case-pro all my brass and use an EGW undersize die, so I am not really worried about fat cases anymore.

Even if you are using carbide dies, use case lube like Hornady One Shot. Your shoulder will thank you.

Go slow and step away when you get confused or frustrated. I have been reloading since I was 12 or 13, and I still learn stuff.