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The Winchester chart makes a compelling argument for 147 grain 9mm v 357 SIG, Noreaster, but unaccounted for is the stopping factor from the 357 SIG's much higher velocity. Penetration is not the whole story. The increase in impact force and resulting tissue disruption and damage is what makes them stop and give it up. While it is true a 147 grain bullet at 995 fps may penetrate sufficiently enough to kill, that is not the objective in self defense.
And then there is the feeding issue. A 357 SIG pistol is virtually guaranteed to feed the bottle neck cartridge. I don't think that can be said for any 9mm round, or any semi auto round, for that matter.
These two criteria, stopping capacity and feeding ability, were two major concerns of the Texas DPS when it gave up the 45 ACP for the 357 SIG.
A third major issue was windshield penetration, and there the 147 grain 9mm comes up way short by comparison.
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