He may run 800 who knows but its not the same thing as Mosconi's record. Mosconi walked in cold and ran 526 on wool cloth.If Mosconi did what John is doing he probably had run a thousand. Having said that I wish John best of luck and glad he is taking the challenge on!
Well, actually, Mosconi probably had half an hour on the table before he started. I find slow cloth easier to play 14.1 on because I try to play close, short position. And, of course, Mosconi was playing with his own set of shiny, polished balls.
Of course it's not exactly the same thing. John won't be playing with a Rambow, either. Or with clay balls. Or Brunswick chalk. Or on a 4x8, which for someone who plays close, short position is a lot easier than a 4.5x9.
It will, however, qualify as an exhibition high run at pool. That's what Mosconi's record is for.