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.40 S&W drops bad guys, if you put the bullet in a vital spot.
.357 Sig drops bad guys, if you put the bullet in a vital spot.
. 357SIG costs more the .40S&W
Gelatin tests can be found here.
https://www.luckygunner.com/labs/
If you’re not packing a G20 in 9x25 Dillon, you’re gonna get kilt in da streetz. .400 Cor Bon is the only acceptable alternative.
Univibe summed it up. On a body in a vital spot, both will kill you. One wouldn’t do it better than the other. Add any other caliber capable of penetrating enough to reach vitals to that list.
The .357 Sig will penetrate hard non porous barriers like metal better than the .40 S&W since it’s faster and the .40 S&W will penetrate porous barriers like wood and brick better due to its greater weight. It’s a wash in my opinion.
The difference is also 0.043" in killing diameter.