Reference (SimulationCraft and Icy Veins)

Reference only, off by default: the optimized Marksmanship priority, which spends Precise Shots before the next Aimed Shot. Procs and charges are hidden in Midnight combat, so it cannot run there; Focus is hidden on Retail, so the 70-Focus Multi-Shot dump on packs is left out. Marks the target and opens with Aimed Shot. Sentinel: Explosive Shot, Volley, Trueshot, Moonlight Chakram before its window ends, Aimed Shot in Trueshot without Precise Shots, Rapid Fire, Kill Shot, Multi-Shot (two enemies with Aspect of the Hydra) or Arcane Shot on Precise Shots, Aimed Shot, Moonlight Chakram, Steady Shot. Dark Ranger: Black Arrow on Precise Shots first, no Explosive Shot during Lock and Load, Aimed Shot before it caps, Wailing Arrow. Three or more enemies with Trick Shots: Explosive Shot, Volley, Multi-Shot to apply Trick Shots, Trueshot, then Rapid Fire and Aimed Shot while it lasts. Calling Trueshot for 30 Bullseye stacks or an unmarked target stays with you.

Adapted from SimulationCraft default action list: Marksmanship, Icy Veins: Marksmanship Hunter rotation (12.1.5).

In game: /rm set marksmanship-guide chooses it by hand; it loads only for its edition and class, and is listed only for the specializations it is for. It ships disabled: an alternative to the recommended rotation for its specialization. Turn it on in game (Rotations, then Enabled) and either turn the other off or give this one a higher priority.