I am looking for your input on this scenario.
I set out at level 1 to build something as near to a modern day sniper as possible within the pathfinder world, and now I am setting at level 9 with plans going all the way to level 15. Here is a simple description of what I should/could have at level 15.
Class: Fighter (4), Rogue (8), Shadow Dancer (3)
Weapon: Seeking Distance + 5 Heavy Auto Crossbow.
Max Dex: 24
BAB: +12
Key Feat: Fair Shot, Vital Strike, Improved Vital Strike
Max Range: 2400 feet
To hit chance: 24-10=14
Key Item: Sniper Goggles
Damage: (3d10 + mod) + (4d6) (Sneak Attack)
Yes depending on DM interpretation the effective range could be shorter due to perception rules, but I see the +1/10 rule as nonsensical. If this rule is used than his max range would be nearer to one range increment, which would invalidate the max range of every bow and crossbow in the game, so you more or less get to pick what rule you want to break.
As a real world example the +1/10 rule invalidates the font size of every speed limit sign on the face of the plant.
Yes it will also be very hard to get line of site to shot at this range the effective range would be much shorter most of the time.