Trained Throw (Ex)Source Weapon Master's Handbook pg. 19
When the fighter makes a ranged attack with a thrown weapon and applies his Dexterity modifier on attack rolls and his Strength modifier on damage rolls, he doubles his weapon training bonus on damage rolls. Unless he has the Throw Anything feat, the fighter can choose only the thrown fighter weapon group with this option. If he has Throw Anything, the fighter can choose any fighter weapon group with this option and apply this option’s benefits to any weapon from that group that he throws.