I basically do what we do in HC mode. When the message from BossMod(or whatever) comes up that he is casting pistol barrage, I run through him with my team if it's gonna hit in their direction, if not, just move the tank outta the way and kill.

I found that it's hard because we've been trained with the new cata dungeons to use CC and interrupts, and at level 19-21ish we don't have any CC nor any interrupts to speak of. Think I got some now that I hit the next level, gonna be interesting to see if it becomes easier.