The big 4-oh.
The magic compromise between 9 mm and .45 ACP. I have no complaints whatsoever about this caliber. It's used by law enforcement all over this section of the planet called the USA.
If you carry a weapon chambered in it, good on ya!
Ladies and gentlemen. Stop fretting about wether the caliber you carry is good enough. The real question is are YOU good enough?
Unless you are carrying something in .22LR or .25 ACP, quit worrying about your caliber selection and worry about wether you can make good hits on a target, drawing from concealment, on the move shooting at a moving target.
I'm 100% confident carrying a Glock 17 with 9 mm 127 grain +P+ Winchester Ranger T ammo.
Don't sweat the small stuff.