Matt.
I have indeed pulled 500 X 20 on several occasions. Oh- no straps. True story.
I have not pulled 585 X 20.
My “recent” powerlifting PR’s in competition are:
606 squat
330 bench press
644 deadlift
While lifting in the 242 pound class. Raw.
A long long time ago, I pulled 600 X 10. No straps, weighing 275. Long time ago my friend.