For me none of them are even close. I can do a 3 board in the mid 400's or so. I have been using a shirt for board pressing for so long, I cannot say with any certainty exactly what I can do for a 3 board raw.
I rarely did 2 boards to a max before using the shirt for them, cause I had pretty significant shoulder pain from doing these, just like I got from trying to max raw. Since I have been using a shirt, no more pain, which, best I can tell, is a good thing.
Max legal grip, by the way, is index fingers on the rings. 31 inches, I believe.
B.