I've accidentally loaded some 9mm Mak brass as 9 Luger. The sizing die seemed to size them down just fine. Only reason I noticed it was because it appeared the bullet was too far out of the case. After doing the thinking about whether it would blow my gun up, I tried it. It fed well, and shot normal.
Would I recommend doing it? No. Does it work in 9mm Luger? Sure.
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