Does dragons breath cartidge
http://www.d20pfsrd.com/equipment---final/weapons/weapon-descriptions/ammun ition/alchemical-cartridges/dragon-s-breath-cartridge
get dex mod bonus to dmg from
Pistol Training (Ex)
Starting at 5th level, a pistolero increases her skill with one-handed firearms. She gains a bonus on damage rolls equal to her Dexterity modifier
http://www.d20pfsrd.com/classes/base-classes/gunslinger/archetypes/paizo--- gunslinger-archetypes/pistolero
