The lack of Many shot is what will put it behind, and after you see the pistelero grit mechanic you'll realize, you should of just gone rogue if you wanted to add precision damage like that
And just how does the rogue Sneak Attack at range (note that there is no such thing as flanking with a ranged attack) on a full attack consistently? Burn through dust of disappearance at 3,500 gp a pop?
At 11th level, after taking the Signature Deed (Up Close and Deadly) feat, the pistolero gunslinger laughs at the rogue when he can apply precision damage to every single shot he makes all the time and even does partial damage on a "miss." At 13th level, the pistolero doesn't need to worry about misfires and trades in his two +1 reliable pistols for two +2 distance pistols and becomes a walking machine gun (alchemical cartridges + Rapid Reload + Rapid Shot + weapon cord and glove of storing + Two-Weapon Fighting feats = lots of shots per round).