The 380 ACP is an all-American cartridge developed in 1908 that has become more popular in recent years. Perhaps shooters have tried compact pistols in 9mm Luger and found them to be a bit much for occasional use. The 9mm’s main advantage — power — becomes a disadvantage in lightweight guns, while the 380 ACP’s lower energy level becomes an advantage.
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In the article comparing the Sig Sauer 9mm vs the .380 ACP, you stated that the two fluted bullet rounds did not expand. I believe that is expected performance for that bulletin design, but they are supposed to create a larger wound channel, making them effective defense rounds. Were you able to measure wound channels as an effectiveness measure for all of the ammo tested?