Varies with bodyweight. Working sets no matter how heavy I am I rarely go above 315/365 though
Don't think I've ever pushed 405 flat, just 365x8. Heaviest decline i do 425 x3, but 315 x15-20 is the usual heaviest I go. Heaviest incline I've ever done was 365x3 in a smith machine (long,long ago). Usually only go 225-245 for 6-8 now.
Don't have the bone-structure/frame to push heavy, especially flat.