>>64415003
>You're also not trading down in terminal effect by going to 9mm.
Not significantly, no, and you do trade up in capacity and recoil control. However, since it's just a military pistol cartridge, it doesn't really matter that much and you can flip a coin and have a good pistol anyway.
Since the U.S doesn't give a fuck about muh expanding munitions, it's not like pistol ammo couldn't be some kind of hollow point anyway.

>thanks for the laugh
He's not really off, full powered loads of 10mm Auto can be comparable to common .357 Magnum loads. Not just talking footpounds here either, but 200gr doing 1200fps is the typical idea of not-FBI 10mm Auto, and there's common .357 Magnum loads with that same projectile weight and velocity from comparable barrel lengths.
Compare to the typical 9mm NATO load of 124gr doing 1200fps, which isn't bad either (9mm NATO is basically rimless .38 Super), 10mm Auto does the same velocity but far more weight, optionally it could load a 180gr projectile going even faster, and still be a lot heavier, so it adds up.

Does any of that make 10mm Auto the ideal military pistol cartridge? Could perhaps be argued, but I feel that 9mm and .45 are probably a safer bet because they're simply easier to shoot and are still adequate.