Thanks for looking into it. The range was approximately 1400 with the Line formation enabled (that should boost range further if I'm not mistaken). Come to think of it, I didn't even try disabling Line formation, but I'll try that myself in a short while.
Edit: I should point out I'm only having the issue with Crossbowmen (should have pointed that out earlier, sorry), and a quick test shows Line formation is not the issue as enabled or disabled, all shots land in a very tight zone about 20-25% of the distance in front of the actual targets.
Edit2: I figured it would save time to simply show you, so here is a video (and I'm sorry for the quality in the video, but I did put my cursor where the bolts land): http://www.youtube.com/watch?v=oxmA3...ature=youtu.be
I also can't help but notice when I switch from Line formation, they lose about 400 range, but barely move then continue to fire again.