PFSRD:Master Siege Engineer
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Master Siege Engineer (Combat)
You are significantly faster at loading a siege engine, as well as a better shot.
Prerequisites: Siege Weapon Engineer, Knowledge (engineering) 10 ranks.
Benefit: If you are the crew lead on a siege engine, your crew can use move actions to load a siege engine. When you spend actions to aim a siege engine, you and your crew can use move actions instead of full-round actions to aim the siege engine (page 160).
Normal: Full-round actions are required to load and aim siege engines.