They do. Note how the loader is involved only with the bottom of the shell when you press the handle. The bases of both rounds are the same. The 9mm Luger round was created by extending the .30 Luger's base all the way--just eliminate the bottleneck to allow for a larger bullet.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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