If you're running the case into the die with the original neck, and forcing that over the expander, then yeah, that's roughly a .050" step. But, that not the proper way to do it, at least not for the Wolverine.* Those of us who have formed cases for that round, discovered it is far easier (and no case loss) it you first cut off the excess case length of the .223 with a chop saw at a point halfway between the shoulder midpoint and the base of the .223 neck. When you run that shortened case into the sizer, it forms the new neck and shoulder, and the expander only touches it on the way out of the neck as you remove the case, ready for a final trim to length. If you aren't doing it that way you are creating a lot of extra work for yourself, not to mention a certain percentage of split necks. I have formed 750 cases using the chop saw, and not a single one had a split neck. Doing it the way you do it, I had nearly a 10% failure rate due to splits on the first batch I did.
In general, when necking up or down, whether moving the shoulder back or forward, you should never bump it more than two calibers in one step. You may also need to anneal in the middle of the process. You may or may not get away with more, depending on what you're ending up with, and how much work hardening takes place in the process.
*If you don't believe me, ask Mark Kexel. He does it the same way I do, as do most of the Wolverine users who make their own brass.