Well, the Belslow could only around 10 tonne on a 3600 nm stage. It had a MAUW of 104.7 tonne, but its economic cruise was a mere 275KTAS at 24000ft. Flat out it was 300KTAS at 28000ft.
Over 3600 nm, the A400M will carry 20 tonne. It has a MAUW of 130 tonne and will cruise economically at 400KTAS at 31000ft. Or, if you really want, at up to M0.72 and 37000 ft.