Your aim is too good to deal minimum damage.
Benefit: You have deadly accuracy with your agility-based weapon attacks. When dealing damage with a weapon to which you add your Dexterity to your attack rolls (all ranged weapon attacks, and melee weapon attacks made with Weapon Finesse), you can reroll any result of 1 on your weapon’s damage dice. Only weapon attacks that require an attack roll benefit from this feat. You must keep the result of the reroll, even if it is another 1.
Adventurer’s Handbook: Genius Guide Volume 1