if youve not seen the thread about my mate kerry..
have a quick look he won the bnbf overall in 2004 when his protien consumption was around the 250g mark per day. If I remember rightly he may have went higher as the contests got closer, Im sure as he dropped carbs he replaced the cals with extra protein so may well have hit the 300/350g per day mark for a short while.
He then took ill due to a high blood pressure 'thing' with the doctor telling him to reduce his protein levels quite dramatically. He dropped to 100g per day and his blood pressure returned to normal, basically to cut a long story short... he went on last year to win the scottish middleweight and came second in the british middles.
I dont think the competition placing are really relevent as a lot can go wrong in so many areas in that respect but if you look at his pics taken in the gym towards the end of that thread he looks in great shape and that was after a long time on 100g protein per day.
maybe it could be argued that his main mass was built on the higher level but I think it is very interesting to see someone in such good shape on a protein level which a lot of people would describe as 'not worth a wank'.