747-400
The 747-400 has 9,50 m from nosetip to first doors, seats in nosecone, 45,6 m from first to last doors, then 15,5 m tail behind the last doors, no seats behind last doors.
So, thatīs why the 777-300 has so much extra capacity... 730 cm longer between doors is enough for 70 extra seats (747-400 has 480 seats in 45,6 metres), which is more than the 747 nosecone can hold.