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There is a reason why most police forces don't arm their officers with 9mm in cold climates as FBI shooting statistics show that the standard load 9mm isn't as effective as the 40s&w or 45acp when shot through heavy clothing.
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It remains to be seen if Hornady has solved the penetration of winter clothing problem with Critical Defense ammunition.
The problem with the 9mm round is that it can't go fast enough, no matter what the bullet weight is. The 357 SIG goes overboard in attempting to replicate the 357 MAG revolver round. A slight downloading of the former in it's various forms might produce an acceptable compromise for civilian self defense carry that would outdo the nine.
This has been hinted at with the 9BPLE round, 115 grains at 1300 fps, which is overloaded to +P+ , if there is such a thing.