I was looking for old school bodybuilding info when I dug out something very interesting.
The first attested record in bench press was by Georg Hackenschmidt, a heavyweight wrestling champion from 1898.
Considering that steroids did not exist back then and nothing hints at him being enhanced, it is safe to assume that he was natural.
en.wikipedia.org
And the amazing mesmerizing record from a 220 pound monster that captivated the world back then?
361 pounds. Or 164 kilograms. 1.65X BW.
ministers-best-friend.com
And that record held for 18 YEARS before it was finally beaten by Joe Nordquest by mere TWO pounds. Just two freaking pounds. And so the pre-steroid record was apparently "just" 363 pounds. Even Omar Isuf is benching more than that today.
Then, after WW2, Doug Hepburn suddenly started breaking all these records, benching 400, 450, 500 in a quick succession. Can you guess what kind of magical enhancement became widely available at exactly the same time? Yep, our good old steroids. Quite the convenient coincidence.
en.wikipedia.org
After Hepburn it's not even worth discussing. The records ballooned to more than double of what even the genetic natural freaks like Nordquest and Hackenschmidt managed to eek out. It is obvious that juice is at play here.
So the implication is obvious: 400 pound bench is UNACHIEVABLE naturally and even 360 is reserved only for freaks. If it wasn't, someone would have benched that weight a long time ago before the steroids came. There's no other way to interpret all this data, unless the information itself is faulty or missing. But it's based on an article from Ironman magazine:
Katterle, S (February 2009). "Power Surge: The Bench Press - History, Records and Raw Lifts". Ironman Magazine. p. 237.