I have to create a character for an upcoming campaign that revolves around firearms. I want to go for the sniper / rifleman route (think Matt Quigley from the movie Quigley Down Under), but I'm not sure what the best route is to go. We have been told we can substitute pretty much any bow/crossbow stuff to work for firearms. We are starting at 9th level.
Right now what I'm looking for is the best way to do one big shot of damage a round at long range. I'm thinking it may be best to go Fighter and use the Crossbowman Archtype, using a rifle instead of bow of course, and taking the standard ranged feats. I'd kind of like to get some stealthy snipping going but I think I will have to multi into Rogue for that. Though with Improved Deadshot at 7th level, I think I would get sneak attack to every readied attack.
Any thoughts would be welcomed.