I get a lot of split neck issues with federal brass, no issues so far with winchester. It would be nice if somebody would do a run or two just to get some new stuff out into the market for a while.
In WSM's? I've had just the opposite experience. WW brass has split necks after as few as 2 firings. I bought a bunch of Fed factory ammo (probably ~20 boxes), and I have yet to have a single split neck with some having as many as 6 firings, and no loose primer pockets either.
Not the same experience that I've had with other chamberings.