Re: Question for those who neck size
IF an FL die can be used to neck size and not touch the case body we can neck size for that die-cartridge combination. That generally limits it to cases with lots of body taper, not often possible with straighter wall cases.
I bought a Lee Collet neck die years ago just to try it. Soon replaced all of my conventional neck dies with Lee's. There is a moving part in it (the collet) so it there's a learning curve. Those who have difficulty with mechanical things and are unwilling to take the time to learn how to use the Collet sizer correctly should stick to more simple 'push the case in, pull the case out' neck sizers.