Awesome gun, I'm jealous. I love the 1911 platform, it is a perfect defensive system. And the 10mm is a devastating round.
The .40 cal is a 10mm short, and the .40 is around due to the accountants with guns crowd, the FBI. The FBI was testing guns to replace the impotent 9mm and tested many rounds. The .45 auto fared very well, but was not unique enough for those guys. The 10mm caught favor with FBI, and it is superior to the .45 auto. But the wimpy agents couldn't handle the muzzle blast or recoil so the .40 cal was developed for them.
The 10mm is the hands down winner as a defensive weapon in reasonable size and semi-auto. Obviously the .44 mag, .357 mag, and .50 cal pistol rounds are badder, but aren't reasonable carry weapons, and reduced capacity as revolvers, slower to reload, etc. The 10mm is superior to the .45 auto, but only slightly.
Great choice,,,,,thanks for sharing.