Mostly because I haven't had the rulebook on me for a while. Like the title says: is there anything in the rules that prevents a monster from calling a heroic combat and barging in the same combat phase?

For instance, an enemy hero is 7" away from my Troll. HC, kill model, go into a fight 1" away from the target hero, win, barge, charge hero.

I just want to make sure I'm not cheating by doing this

There is in fact - p64: "[..] a Monster cannot use the Barge Brutal Power Attack in the same turn that is also participates in a Heroic Combat - only one or the other may be used in a single turn."

Alright, as I suspected. Thank you!