This is the style of macro that I use for each BRD attack:

/macroicon "Straight Shot"
/ac "Straight Shot" <t>
/ac "Misery's End" <t>
/ac "Bloodletter" <t>
/wait
/ac "Misery's End" <t>
/ac "Bloodletter" <t>

Because all my attacks are configured this way, Misery's End and Bloodletter are always used when they become available.