"9mm or .45" or "which hollowpoint expands best".
I'm a .357sig man... and only because the semi outloads a .357mag revolver!!! Always at least 2 or 3 additional mags... Loadout, fmj/hp alternate each mag. And Underwood full spec (sammi) loads either 1475 or 1500+ fps! Especially in winter with extra clothes, thick jackets, etc.
And I keep my aim sharp... 10 yards
(Old pic, but haven't changed much) lol
These are the things to worry about...