The .38 Super is a straight walled case, where the 9MM is tapered. While you might get away with using a 9MM sizer, it won't size the whole case, which might cause feeding/chambering problems.
I don't know though. I haven't tried it. I bought .38 Super dies.
The same dies are used for 9x19, 9x21 and 9x23, but not for .38 Super. The first three are all tapered cases of the same dimensions in diameter, but only differing in the length of the case. The 38 Super is a straight case and is different diameter than the others.
Use the proper 38 Super dies, otherwise you will be overworking the brass and making the expanding function more difficult, and cutting down on the brass life.
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