75+% of the delegates are bound on the first ballot. Just by fact, unquestionably.
Of the remaining 25% or so, the 150 RNC delegates will vote by tradition however their state went. After that you have the morally bound. What's left over is the group that truly isn't bound. Even out of those, you have issues of in some cases the candidates presenting a delegate slate that is voted on, with the delegates personally chosen by the candidates, yet they're considered unbound by the state in documents, but it's highly unlikely they'll vote counter to whoever put them on the slate. It's why going strictly by who is and isn't bound leaves out many nuances that allow much finer grain predictions to be made than simply looking over some website is going to give you.
Even in your predictions, McCain is short what? 150 or so when you count in California?