A Big Bull to my standards is a 5,6, or 7pt. with long brow tines, sword like royal points(4thpt.)-- and for width-- a bulls chest measures approximately 22"- 24" wide looking head on at a bull, if his rack is at least twice as wide as his chest, then you're more than likely looking at a record class bull.
Big=265+
Exceptional=330+
Monster350+