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You also get increased cartridge weight which means more weight for a given magazine capacity, a bulkier cartridge and also one with increased recoil, with a less aerodynamic bullet that has a much less flat trajectory.
The benefits of the 4.6mm round go beyond simply being able to penetrate armor.
>increased stopping power
This is an outdated concept in my view.
Have a look at [this study](http://www.buckeyefirearms.org/node/7866) about handgun “stopping power”, the conclusion is that once you reach a minimum energy level, shot placement is the most important factor:
>The results I got from the study lead me to believe that there really isn’t that much difference between most defensive handgun rounds and calibers. None is a death ray, but most work adequately…even the lowly .22s. I’ve stopped worrying about trying to find the “ultimate” bullet. There isn’t one. And I’ve stopped feeling the need to strap on my .45 every time I leave the house out of fear that my 9mm doesn’t have enough “stopping power.”
If someone is coming at you with a gun, hitting them in the leg with a .45ACP is not going to stop them from shooting back at you. Hitting them in the head with a tiny 4.6mm bullet will. I don’t think there’s anything “stupid” about making sure a cartridge is as accurate as possible by virtue of its low recoil and flat trajectory, as well as being light and small enough to enable more rounds to be carried.