Deadly Aim (Mythic)
Your aim is truly devastating.
Prerequisite: Deadly Aim.
Benefit: When you use Deadly Aim, you gain a +3 bonus on ranged damage rolls instead of +2. When your base attack bonus reaches +4, and every +4 thereafter, the bonus on ranged damage rolls increases by +3 rather than +2.
Source: Mythic Adventures, p. 61