The 10mm is the real deal, a superb caliber killed by political correctness. The FBI original adopted the 10 after the Miami FBI shootout, proving once again what a lousy caliber the 9mm is even with HP rounds, but it's recoil was to severe for the quota females they were forced to hire. So the 10mm "light" was created, aka 40 S&W. The 357SiG is a fine round as well, but just not in the same league as a 10. That's too bad, the 10 is all but dead. jorge