I doubt you'll see much difference at 100yds with an average hunting rifle by not resizing the neck after pulling and seating a new bullet. Neck tension will affect accuracy but the average rifle won't show how much (with statistical confidence) without shooting a LOT of 5-10 shot groups. A very accurate LR rifle or BR rifle may be a different story, but in that case I would only use such rounds for fouling or practice. Still, I will normally run the case back in the FL die and go about 2/3 down the neck but not touch the body. The de-cap pin is removed on all my FL dies and this method doesn't require any lube.
I use the Lee FC on a couple calibers and it will help, but you still won't have the "same" neck tension as on a round that had been re-neck sized. And either one would most likely be a little different than a case that had been fired and sized normally. It gets down to how fine do you want to pick your nits...
Good points.
DF
