I think Taneshima might be right, seeing as how none of the Warwolf or Direwolf gear has any accuracy on it. Although if there were in fact a pvp accuracy cap, my guess would also be around 400 accuracy. Any higher and we'd end up having to use up most of our given pvp materia slots on accuracy.

On an unrelated note, your avatar has a new haircut everyday Longnu. Don't you know the devastating consequences this can have on healthy hair???