Find the right pve geared guy and you can hti quite hard...
Off the top of my head i've had...
I've had a 16k+ overhead slash (this guy must have had terrible gear even hit him for 12k with vigilant thrust), 16k+ clashing blast, 18k+ demo round.
None of the toons apart from the sent/mara ( i cant remember which one i did it on but it was combat/carnage) is geared... all the others where in basic exhumed.. my commando wasnt even augmented.. just gotta find the right guy with really bad pve gear