So looking at the reference 744 and 77W charts from Boeing, say you want to go 6000 miles at full passenger load and cargo.

The 744 at the 875K MTOW and PW engines seems to be able to carry 416 passengers and 48,000 pounds on said mission, is that right?

The 773 would carry 301 passengers and 4400 lbs of cargo, does that seem right? Of course this doesn't seem to be the 300ER either.

hmmm. more google searching.