Didn't the FBI have the 10mm cartridge developed because the 9mm was inadequate? Miami shoot-out?
Also, if you're so inexperienced as a handgun shooter, that the biggest round you can effectively handle is a 9mm, you have no business using a hand gun for defense purposes. It doesn't take that much training to become proficient with any semi-auto pistol.
And if you need 17 rounds of ammo, because 14 or 15 isn't enough to get the job done, you're really not proficient enough to use a handgun for self defense either.
