222-17mk4
Your components are fine, at least they are in the middle of what works. As for forming from 223/222 I have 2 sets of form dies, 222 to 221fb and 221fb to 17mk4. Using both sets I've not had a problem with the shoulders but I did have to run them through an K&M expander and neck turn. I also had to anneal before fireforming or I lost some cases to splitting necks and shoulders. The whole process is a PIA and I only bought the form sets because of the sketchy availability of 221fb brass and the fact that I have so many rifles built on that donor case. Upside is with those dies the issues of FB brass is moot, you have the ability to make what you want.
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