The topic for discussion at my local range was Lee factory crimp dies & the accuracy they improve on. Has anyone tried a comparison using a lee factory crimp die vs. straight neck tension?

On a lighter note, Santa (my loving wife) brought me a Lee neck sizing collet die set. It comes with a collet neck sizing die, a much better bullet seating die than what I have in my other die set and a standard FL sizing die. I'll be trying out some .270 / 130gr ammo I put together later today as soon as I can sneak away from the office. It sure does make life simpler & easier just sizing the neck, clean 'em up a little and reload 'em.
Can't wait to try the new reloads out.
Would it be a reasonable assumption that I may have to adjust the powder charge by changing from FL sizing to neck only sizing?