Once per turn when you roll damage for a ranged weapon, you can re-roll the weapon’s damage dice and use either total.

In addition, when you are wielding a ranged weapon, you can make a special attack with that weapon as an action, a vital strike:

Vital strike. On a hit, the attack deals an additional 1d4 damage. This damage bonus increases to 1d10 at 5th level. The attack deals an additional 1d10 damage when you reach 11th level (2d10) and at 17th level (3d10).