George, with the information I have at hand:
Off a 2400m rwy @ 1800' AMSL
-100 @ 50 degrees C 38290 kg Flap 18
-200 @ 26 degrees C 42880 kg Flap 24
-300 (507 engines) @ 38 degrees C 44370 kg Flap 24
Using a 300 as an example, a 700nm sector would require a nil wind flight fuel of 4200 + 10% variable reserve + fixed reserve of 950 = required minimum fuel load of 5570 kg.
Assuming 87 pax (our config) @ 100kg including luggage + 500kg freight, you'd end up with:
EZFW of 35299kg
MLW 39235
+ FBO 4200
= MRW 43435 this is less than MTOW, ie LDg Wt limited. You could carry a fuel load of 8136 kg, 2566 kg margin fuel.
I'll check perf figures for your desired rwy lengths when I get into the 100 this afternoon.