As a SS gunslinger most of your damage is white so tanks are bad news for your since their armor actually works against white damage. Look for healers and light-medium armored people. I look for healers then DPS and go for tanks last. My rotation is flourish shot, charged burst, trickshot, speed shot, which will 9/10 proc ur aimed shot then do aimed shot, trickshot again. They should be dead by then but if there not its situational.