That's an interesting rule of thumb. At lower weights, it sounds like a reasonable guideline, or at least something to shoot for in terms of overall functional strength. That said, I suspect that it looses relevance at higher weights. For example, one guy I saw at a meet benched a raw 550. COuld he be able to do a rep with 245's (550*.9/2=247.5) It just seems like you would get hurt just setting the wieght up to press. Or going further- what about monster raw benchers like Mendy? What's his shirtless- like 700, right? Using the same guideline that would work out to 315 DBs! Could that be possible? Christ- what would those bells look like?