I have read about having to neck turn 260 cases that are sized up or down from 243, 7-08, and 308 (typically using high end brass i.e. Lapua, Nosler, Norma). I have also read that some have not had to turn necks at all, they just resize, load and fire with no problems (typically using Winchester or Remington brands from what I gather).

How do you know when you need to neck turn?

Does anyone have any experience with resizing the different brands of brass?