Make sure that the case is belled. Make sure that the seating stem is screwed out so it can't touch the bullet. Raise the case, with seated bullet in place to the top of the ram's movement. Slowly screw the die body down until you feel the resistance of die body's contacting the case. Lower the ram a little. Screw the die body down 1/4 turn, and tighten the lockring. Raise the ram and crimp the cartridge. Leave the ram up and screw the seating stem down until it touches the bullet, then secure the stem.
You only crimp enough to remove the bell.