His brother Frank says his best was 475. In his biography it says he did, or close to it, 600. It probably is inflated. The exercise alone isn't a measure of fighting ability but I'd rather have a good bench than not. His tryout training routines (which had no weight training but a lot of calisthenics) are where it's at for conditioning. They'd do 200 squats, 50 or so push ups, stair running drills, carrying drills, pull ups, and more without rest until you were (even if you made it) obliterated. Then the real sparing began. Great tests for endurance and perseverance.