IIRC, they did in fact use armor piercing rifle ammunition, with steel penetrators. I can't remember where I saw/heard the reference, but the distinction was specifically made between standard ball and the armor piercing rounds used by the bad guys.
"Shootout" is more than a little too melodramatic for me, but then most of the history/learning/discovering-type shows are these days.
"Shootout" is more than a little too melodramatic for me, but then most of the history/learning/discovering-type shows are these days.