Of course its possible. My good friend, Ryan Gillis, Benched 500 when he played offensive line for the Central Florida Knights (UCF).
He was also 6'4 315-320 pounds at the time. I know for a fact he was clean. He was tested 5 times, including "suprise" tests by the authorities. I am very close to the family & have known him a long time. He is a BIG MAN.
He specialized in the bench press-and he was huge guy. He played with Dante Culpepper, and played Arena football for Orlando.
I'll admit it was hard to believe, but he never partied, and force fed himself around the clock. But for a guy that is 5'7", and weighs 230-240, I would have to say "no".
What stops alot of guys from going heavier & heavier are shoulder problems. After he retired, he had his shoulder "Cleaned out", where they shave off the bone spurs that are digging into the rotator.