Try 600, it's even worse!
I eat a lb of chicken and a bunch of carbs for breakfast - 127g's
Then 1 100g shake and oatmeal for 2nd breakfast. - 100g's
Then Chicken beef or fish for lunch with fat, no carbs - ~100g's
Then Chicken beef or fish for 2nd lunch with no fat, no carbs - ~100g's
Same for dinner with lots of green veggies, no explicit carb intake - 120g's
Then a mixed casein/egg/whey protein shake just before bed - 100g's
That's two shakes a day, not too bad. I was at 295 when hitting it like that and I could not gain an ounce. I would have had to take it to another level to keep gaining and probably add more carbs. I'm cutting now and follow almost the same with slightly smaller portions and more cardio. Down to 271 and my lifts are still increasing. As long as I keep the carbs low after lunch, and non existent towards bed, I can still stay lean.
BTW - Your gonna feel like a bloated pig 24/7. Takes a little getting used to.