Projectile guidance

Projectile guidance was a force power perfected by the Ysanna of Onderon. Using this power, a tribesman was capable of bending and "guiding" projectiles fired from their Concussion bows with extreme accuracy, making them incredibly precise marksman. Projectile guidance was not a particularly taxing ability, as Ysanna were seen plenty of times firing entire clips out of their rifles and guiding the bullets through the force, though it most likely required concentration and distance to use proficiently, as Ysanna are not seen using the ability at close range targets.

Source

 * Dark Empire II