It's annoying/MAD that the Gunslinger's maximum Grit, Menacing Shot, and Stunning Shot are based off of Wis (or Cha), but that your ranged To-Hit, Gun Training, Bleeding Wound, and Death's Shot are based on Dex. Does Pathfinder have an equivalent to Zen Archery? (Or can you just take Zen Archery? It's supposed to be backwards compatible with 3.5? Right?) If so, you could buy a Monk's Belt and magic bracers and be Wis SAD for most of your progression.