(NOTE: All macros with the Kill Command may lock up due to a bug that is targeted to be corrected in the 2.4.2 patch - origional post) 

1:1 Shot Rotation Macro (Basic)
#showtooltip Steady Shot
/castsequence reset=3 !Auto Shot, Steady Shot
/script UIErrorsFrame:Clear();

1:1 Shot Rotation Macro (with Kill Command)
#showtooltip Steady Shot
/castsequence reset=3 !Auto Shot, Steady Shot
/castrandom [target=pettarget, exists] Kill Command
/script UIErrorsFrame:Clear();

1:1 Shot Rotation (with Lightening Breath)
#showtooltip Steady Shot
/castsequence reset=3 !Auto Shot, Steady Shot
/castrandom [target=pettarget, exists] Kill Command
/cast [target=pettarget,exists] Lightning Breath
/script UIErrorsFrame:Clear();

1:1 Shot Rotation (with Alternate Kill Command)
NOTE: Be sure to put the Kill Command on the MultiBar location to the one state within your macro. (eg. Multi-Bar Bottom Left Button 12 in the macro below.)

#showtooltip Steady Shot
/castsequence reset=3 !Auto Shot, Steady Shot
/click [target=pettarget,exists] MultiBarBottomLeftButton12
/script UIErrorsFrame:Clear()