I am guessing here, but the early Lee dies did expand the neck, however the entire rod was the expander diameter. Later they went to a rod with a tapered expander on it. Call Lee and ask which rod you need. They are easy to work with. My expectation is that the same rod for a .308 Win will work.
Looks like I guessed wrong. The Lee website shows the .30 carbine dies using a pistol decapping rod, so they do work like pistol dies.
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