Dr. Roberts '& others in this field" can say what they want, but they're not carrying guns into dark alleys or subway cars at 2AM. I believe it was Jim Cirillo, the NYPD gunfighter who opined that whatever you brought to a shooting was never big or powerful enough. Before his untimely death, he wrote that a .41 Mag full charge wadcutter load would be most effective. A carry weapon is not a 'nice, fun gun'; it is designed for ugly serious business up close.
Perhaps it would be of value to read the thoughts of veteran LEOs on this Forum with decades of experience as to what they used and what they felt would be effective.
686+ with 2.5" bbl? The heaviest .357 load you can handle in double-tap fire. If you can't, then practice it. Oh, and I'm more concerned about the BG than my hearing.
Kaaskop49
Shield #5103
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Best $1.80 I ever spent!
Yep, and you will likely set him on Fire as a bonus!