There was a time when I meticulously prepped cases for my hunting rifles/cartridges. I don't anymore. I would sort cases by weight and/or volume, drill the flash holes, uniform primer pockets, measure the thickness and diameter of the rims (and this can make a difference in the WEIGHT of a case--but has no bearing on the VOLUME--something to think about when we sort cases by weight), check runout to ungodly tolerances, turn the necks and neck size only.
Today I still will sort cases by weight, but only to throw out really, really bad ones (my paramenters are much wider now, deburr the flash holes, and PARTIAL RESIZE. If we are talking about hunting rifles with normal chambers, partial resizing correctly may be one of the more important steps in accuracy--in chambers that are chambered to accept all the factory rounds from different manufacturers. This includes custom barrels
on hunting rifles.
Now back to neck turning. Those hunting rifle chambers have necks that are generally large enough that turning them just doesn't make a difference. But I have an Ultra Light Arms custom rifle
that does like to shoot neck turned cases. Many of these high dollar custom hunting rifles
will produce amazing groups--but with the ammo they were developed and chambered for (ie. Fed Gold Medal Match, Black Hills, etc). These rifles need those "cutomized" cases to shoot handloads well.
The bottom line? I found that I hurt or made no difference in accuracy in most of my hunting rifles by turning the necks. Runout in neck and loaded rounds is important, but we can measure things so accurately with our tools these days we have a tendency to "over" focus on these things. Something I have to constantly remind myself: The benchrest world pays a lot of attention to these things because they have super custom, super tight fitting chambers with super finicky rifles/loads built to each shooters ideas of what makes accuracy--these things make a difference under those conditions.