He actually bulked up into the 240-250 range in the middle 60's, but was flummoxed after cutting back down to competitive 180's-190's because for all of it, he only gained several pounds of muscle.
He won his Olympia's in the 187 to low 190's range.
Actually, for his last Olympia at 41, he went on stage at 205 (heaviest ever competitively) and likely lost the title due to the concomitant loss of definition that came along with it.