Hammerwiki:Ballistic Skill

Ballistic Skill (BS) is a stat that represents a character's aptitude at making ranged attacks, using missile weapons and thrown weapons. Characters with higher ballistic skill cause more damage and have a better chance to land a critical hit with ranged attacks, and a reduced chance that their ranged attacks will be blocked or evaded.

Mechanic
Ballistic skill / 5 = Increased ranged skill damage DPS by result.

Ballistic skill / 10 = Increased ranged auto attack damage DPS by result.