Nope, Prinzip and his three friends carried Model 1910s in 9mm Browning Short (.380 ACP). Prinzip's was serial number 19074.
I know of a shooting that involved one man with a .45 auto and another with a .44 Magnum. They each fired one shot at under 10 foot range. The man shot with the .45 died an hour later; the one shot with the .44 died the next day in the hospital. So neither of those "super" rounds killed instantly (I don't know where the hits were).