Your ranged damage is increased by +1[W]. You also gain 2% dodge bonus when using a ranged weapon.
The notation'[W]' stands for your base weapon damage. NOTE: This feat was changed to apply +1[W] regardless of point blank shot range. It was tested and confirmed to be working appropriately. See the following thread for the testing: link
Combat Archery gives an additional +1[W], but the effect does not double the base damage. The increase comes from double (due to player already possessing point-blank shot, which is a prerequisite for this feat) to triple as 3[1d6] if base is 1d6 or 3[2d4] if it is base 2d4. See also weapon dice multiplier.
This is an Epic Feat that you can take at level 21 or later.