In patch 3.0.8 Steady Shot was nurfed by 10% damage, so I have re-written my mashable macro a little to weave in Arcane Shot to increase it's damage.

#showtooltip Auto Shot
/cast Kill Shot
/castsequence reset=shift/target Hunter's Mark, null
/castsequence reset=target/3/alt Arcane Shot, Serpent Sting, Steady Shot, Steady Shot, Arcane Shot, Steady Shot, Steady Shot, Steady Shot

Basically the same as the first version I made, which you can find here along with the explanation on what everything does.

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