i've pulled 545 for a very hard single at my best.
I've seen his picture and its possible.
The most i ever did was when I was lifting with heaps of momentum (cant believe i never injured myself), and i pulled 360 (including the bar) for several reps. All i remember is that i felt like my hamstrings were going to rip out of my legs and that I could have injured myself.
My best this year is 220 slow and controlled for 5 reps (lets just say it felt really fuckin heavy and i had to give it my all) I aim to get to 250, but i dont do explosive lifts so my poundages are not that high. i am not comfortable doing them explosively anymore.