FYI, Called Shot can be used with ranged weapons and can be used on each attack per round. I have fond memories of that feat being used by two high level AA's at once, totally immobilizing enemies... *Sad panda*
That's a feat from a custom base class from the Player Resource Consortium (a very extended set of base classes, prestige classes, races and, alas, bugs). So, it's not in the toolset
The Guide to Building Volume I It's fun!