The standard RCBS .357 SIG die set is what I use, and it is indeed only two dies. The case is essentially a miniature bottleneck rifle case, so an expander isn't really necessary if you're loading jacketed bullets. And, like rifle cases, you do need to lube them. I guess you'd need to add an expander if you wanted to load lead, but I've never tried that with the .357.
I'm one of those who does the preliminary resizing with my .40 S&W carbide die, then uses the .357 SIG sizing die to do only the neck, which doesn't require lubing cases. I can fit everything in my progressive press, so there's really no additional work involved. Even if I only had a single stage, I'd still do it that way, accepting the extra step to avoid dealing with lube.
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