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Originally Posted by Deaf Smith
... I suspect the .357 Sig expands to the .63 call earlier, after impact, than the 9mm and thus does more damage. Yes same penetration but more volume of damage for that amount of penetration. ...
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In most cases,
earlier expansion is exactly what you get out of extra velocity/energy ... but
at a cost of penetration, which is generally an inch or so less.
Since you still get +12" of penetration, so no big whoop, and it can be said that you do indeed get a slightly better "something-or-other" with higher velocity rounds like .357sig. I'm not certain it's anything important, but it's
measurable.
Whether that confers any real advantage owing to those factors, or a disadvantage owing to more recoil ... I think we're in the area of raw conjecture, YMMV and opinion at that point.