Milos squatted 575 for 5 reps at my gym in 1999. high bar, feet together, heals on 10 pound plates, rock bottom reps. he was 270 lbs. at the time and had a bad lower back. we measured his arms as well, and they were bigger than all the guesses on the post here about his arm size.
and no, i don't bullshit about lifts or measurements - ever.
rik