I use the .357 expander die to load .356 bullets and it works perfect. For 2010 they have expanders for lead bullets that are ,according to the tech support guy, 1 or 2 thousands larger. He didnt have one to measure yet.
Curious. Does the Hornady powder through expanders work for .356 and .401 bullet widths? Or, just .355 and .400?
Jim