If you like the tension achieved by the collet die, then remove the bushing from the FL Die and use it like a body die.
FL size the case first, then collet the neck for the least run out. IMO two stage sizing is better for accuracy. Also, After sizing with the Lee Collet Neck Die, let the cases stand and 'rest' for a few days after sizing. I have noticed the brass springs out to a more consistent seating force, than of you were to seat bullets right away. This is a benefit, because this allows you to prep and size brass ahead of time, and have them ready to load at your convenience. This proceedure is the opposite of a bushing type die, where you need to seat bullets as soon as possible, after sizing, to get the most consistent seat force.
Gregg Jacob said:
If you're serious about reloading just get Redding Computition Dies and read everything about reloading and have fun.
I beg to disagree that the Redding dies are the catch all, do all, There is nothing wrong with the Lee Collet Die, this design is the best for neck sizing. However, the problem with Lee is the finish of the die, but the collet on the mandrel sizing method is the best.