I'm following up with this thread again, as I've recently invested in a Lee Pro Auto Disk powder measure, and found myself in need of powder-through capabilities on my 38 special and 357 magnum die set once again.
Since I load for both calibers, I decided to just go ahead and order a second expander for 38 special.
I needed some other odds and ends from Lee(including a bullet seating plug) so ordered directly from Lee a 38 special expander die body, as well as expander plugs for both 38 special and 357 magnum.
The 38 special die body is noticeably shorter than the 357 magnum. In addition to this, the 38 special expander plug is longer in the "shoulder"(though not in the expander portion) than the 357 plug.
Here's the 38 special plug on the left, and the 357 plug on the right.
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