All very true. But, I'm more thinking of a small bullet making a small hole. I was very interested to read in BHD the views of the one SF trooper who felt that the .223 was just going through the bad guys and not stopping them. He'd much rather have had a .308.
Don't get me wrong, I'm a firm believer in the Roy Weatherby school of faster is better. And the Robert Rourk theory of Use Enough Gun. Until you get to using .470 Nitro's on groundhogs, there is no such thing as overkill. There is DRT (dead right there) and having to track.
But, all things being equal, I'd rather trust my life to a .45ACP 230grn Hydro-Shok doing 850fps, than a 9mm 147grn Hydro-Shok doing 1000fps. Hopefully I never have to find out, but that's the way I'd bet.