The amount of force on your press handle will vary by caliber and if you take the time to smooth the mating surfaces of the collet die and apply lube.
With experience you will feel the die size the case neck. The force is just a guideline to keep you from stripping the threads of the aluminum cap. This can happen if you apply excessive force.
I am a big fan of the collet die. I only mention the variables that you need to learn to use the die properly.