there is no reason a large bullet cannot expand as well.
I'm not as certain of that as I used to be (and I carried a P12 as the ideal more big bullets is better handgun). I'm frequently surprised looking at ballistic gel tests for different types and make/model of ammunition. I have both 9mm and .45acp handguns (and my wife has a .38Super) and keep researching test results to see what performs in gel.
As to "enough", is "more" as well as velocity and mass part of that? Again, it isn't as simple as in the days when our options were more limited. If "ideal" defensive handgun/ammunition were the discussion, on paper a 10mm xtp out of a full length 15rnd capacity pistol would probably win the gel tests for defensive load. That's more, faster, and heavier than the 9mm and not much behind the .45acp for mass. The one caveat is that recoil isn't "friendly" and that will influence follow-ups for folks that don't master it. Another is that flash will be considerable making low light more challenging for follow-ups.
I would be comfortable with XTPs out of a 9mm in the home or carry or my traditional .45acp Golden Sabers.
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