My hunter is:

Proc:

/stopmacro [channeling]
/cast Explosive Shot
/cast Black Arrow
/use 13
/use 14


Main:

/stopmacro [channeling]
/castsequence reset=target Hunter's Mark,Serpent Sting,Cobra Shot,Cobra Shot,Cobra Shot,Cobra Shot,Cobra Shot,Cobra Shot, Cobra Shot,Cobra Shot,Cobra Shot,Cobra Shot,Cobra Shot,Cobra Shot
/cast Rapid Shot

Third step is kill shot