I read this in a manual and what I do is to back the crimp way out of my die and seat my bullet, see how it seats in my barrel, adjust the seating nob ¼ turn, check fit to my barrel and keep repeating that cycle until the cartridge seats properly.
Make sure the ammo fits in my magazine and feeds with that OAL
Once I get the OAL that works with that bullet in my barrel I back the seating nob way out, put the round in the shell holder and run the ram up, and then adjust the die for crimp.
Once I get the crimp I want, then I bring the seating nob down to touch the top of the bullet.
Now my die is setup for my gun with that bullet