My training buddy is a good deadlifter 320kg/705lbs. I know you need the right build for that lift yada yada, but i've seen 5.3 bb:s pull 240kg/530lbs. The dude who pulls 320kg says that ANY healthy man with some manhood should be able to pull 200kg/440lbs.
I could do this at 16 y/o. 3 or 4 months after learning the lift. Back then i was clean as well. 260x1 is my best single (bw 235 lbs...on1g sustanon as well), consider 210kg/460 x 21 is better though (bw of 200 lbs, about 5 weeks out on 500mg test, 1g eq, 50mg wintabs ed) What about yourself whats your best pull?