I agree with The Pumpster. 300lbs is quite an achievement, even for men who have been benching for awhile. Of course I'm speaking of regular BB'ing. Joining the 400 bench club is the Holy Grail of most. A natural gifted bencher is not that common, where 300 may seem even moderate to them. I've seem a few Pro's train and most of their benches are half to three quarter reps at best when nearing, or over, the 400 mark. Those 20" guns doesn't always mean you have a huge bench. I would say that their current trend is towards using machines rather than regular flat bench presses, keeping that rep range at 1/2 to 3/4's.
I could never see the attraction of the BP, believing that dip's (weighted) can be a better all around upper body movement. That would also include overhead heavy pressing movements. But that's just my view. I would be twice as impressed if someone could clean and press (or even jerk) a 300lb BB than doing a 300lb bench for reps. Good Luck.