Originally Posted by gunnut07
8mm? What 8mm cartirdge is that? The only one I know of is the 8mm Nambu and it is bottle necked.
The 10mm was Created by Jeff Cooper as a slightly slower cartridge for the Bren Ten pistol. The FBI went to the 10mm for some field tests. They found that in the 1911 platform it was too much gun for many agents to handle esp women and smaller men (Girly men). The 10mm is far superior to the 9x19mm. It is the only semiauto cartridge that you can hunt with other than the 357 mag Coonan or the Gangster Desert Eagles.
"Slightly slower" than what? As designed the 10mm was a Magnum powered cartridge. It was slowed/dumbed down to the point the engineers saw they could match the watered down ballisitcs in a cartridge that would fit in a 9mm sized pistol. Hence the .40 S&W (Short & Weak).
Asking why a 10 mm is so much larger (longer) that the other two is like asking why the .300 Remington Ultra Mag is so much larger than 7 X 30 Waters when they are less than one millimeter different in diameter.