HiBC - The .30 Carbine is roughly equivalent to shooting a .357 Magnum from an 18" carbine (give or take ~200 fps).
But that reminds me. While everyone is talking about what would hit hardest or possibly penetrate soft armor, I have to wonder what Fiocchi's 142 TMC would do.
Oh ow! That's gonna leave a mark.
At 1250 fps with all of its energy focused on that small meplat, I have to believe that if it doesn't penetrate, it'll sure get the perp's attention.