Snipper (3.5e Feat)
From D&D Wiki
You excell at taking down enemies from afar with extreme percetion precision.
Prerequisite: Bab+4, A percision damage class feature (such as Sneak attack or Skirmish).
Benefit: Percision damage can be applied to attacks on any creatures within a weapon's range increment (e.g. 100ft for longbow).
Normal: Percision attacks can only be made against creature up to 30ft away.
Special: Anything that increases the range increment of your weapon such as spells or enchantments work with this feat.