Some of the claims here are absurd. But ask yourself: how much a boxer can squat? We can talk about deadlifting as well.
The only story I heard about Mosley was when he was using a gym and the owner was someone I knew. The story goes that Shane and a local heavyweight were playing around on a bench and Shane benched over 300lbs and the heavyweight could not. I think at this time Shane was a welterweight/jr middleweight. I wasnt there but I remember the story because of course that led to the owner thinkingShane was on the juice.