I think a lot of people should probably reevaluate exactly why they choose to neck size these classes of cartridges. The benchrest crowd can neck size a couple dozen times without any problem whatsoever, not withstanding the precision type of action used and the meticulously selected cases.
Anyway, it can be done, factory chambers being what they are, but is it always advisable? The whole theory being that the case is already fireformed in the specific chamber and now all that needs to be done is resizing the neck area so it has the proper tension to hold the bullet. This procedure doesn't allow for brass flow and stretching which can be cumulative.
I guess what I'm getting at, having hunted the dark continent, is the whole controlled feed, slick chambering required for dangerous game and why one needs a 375Weatherby Magnum for such pursuits. As far as I am concerned, full length resizing is the way to go, in leu of the best factory cartridges money can buy. JMHO. BB