I didn't say the 40 was a bad caliber, I said it wouldn't do anything the calibers that bracket it wouldn't do. The just isn't that much difference in performance to justify a "need" for it. Notice I said need, I didn't say it didn't justify a desire for it. If you pick it as the caliber you want that is fine, it will do a great job for you but it won't do it better than a 9 or 45 will do.
Not to stir up a caliber war, but I respectfully disagree.
Will the .40 perform better than the .45?
Not really, but it doesn't perform any worse either, and it offers increased magazine capacity in similar sized handguns....and more bullets is better than less.
Will the .40 perform better than the 9mm?
In my opinion, yes.
It is a heavier slug with greater diameter....and like the saying goes "a 9mm might not expand, but a .45 (and a .40) will never shrink".
And the .40 still has very good velocity too.
Some 9mm rounds are very good, but some are not so good.
But there really isn't a bad .40 round.
The .40 essentially gives .45 performance with nearly the magazine capacity of a 9mm....and in a 9mm size handgun.
However given identical guns, one in 9 and one in 40 a shooter will be just a bit faster with the 9. You cannot change the laws of physics with training, the lower recoil impulse will mean faster time back on sights and target.
9 mm Luger - Recoil Impulse of .78 ms- Recoil Velocity of 17.55 ft/s (5.3 m/s) - Recoil Energy, 6.84 ft·lbf (9.3 J)
40 S&W - Recoil Impulse of .88 ms- Recoil Velocity of 19.73 ft/s (6.0 m/s) - Recoil Energy, 8.64 ft·lbf (11.7 J)
Not necessarily.
The guns would never be "identical" since you're not going to use the same recoil spring for a 9mm and a .40....at least not if you're smart.
And the barrels will be different as well....slides too most likely.
So now you have to factor in the effects of a stronger recoil spring, a heavier slide, and a heavier barrel.
In any event, the time difference is really not enough to be significant....we're talking about 1/3 of a second difference.
There is a solid reason competition shooters like the 9 for speed competitions, they can run the course of fire faster.
True, but in competitions the shooter is just punching paper....they're not trying to stop a human opponent.
The .40 was designed for street performance, not paper punching.