Well, I'm 225, 6'2, train natural and not particulary strong by any measure, but I've repped with 386 a few times. I don't train to bodybuild or powerlift, just to look fit and feel energetic. I'm sure Arnie with all his roids and experience can easily lift 500 or more. Hell, there's a guy in my gym that trains once a month when he feels like it and reps 480 with ease.