I recall Kerr saying this and it is believable in fact if he would have claimed over 500 I would have believed him. I think someone in Coleman's camp said he did 550! Also recall reading that Lesnar said he did 455 while preparing to try out for the Vikings although when heavier in WWE others have made ridiculous claims that he did 700! LOL Guys just do not bench anywhere near 600 unless they are absolutely gifted and physically wired to be benchers replete with years of work developing efficient technique.