Sami, below are some updated data figures for the fleet.
Srs 102:
MTOW: Same
OEW: Same
MLW: 56,699 kg
MZFW: 51,255 kg
Weight less fuel and payload (??): 39,916 kg
Payload:
Max: 11,339 kg
Cargo hold: 750 cu ft
Range:
Same as in DB. Ranges for 102 (max payload, 2945nm; 6114kg @ 3690nm) are at EcoCriuse speed of 285knts. Britianna family cruise is 310knts, therefore ranges would be different (lower)
Srs 302:
MTOW: 77,110 kg
Max payload: 12,700kg
Srs 305:
New Summary: The Bristol Type 175 Britannia is a British medium/long-range airliner built by the Bristol Aeroplane Company with a purpose to connect the British Empire. The Srs 305 has increase fuel capacity over the Srs 302, but is weight-limited due to strength of its fuselage skin and undercarriage.
MTOW: 83,914 kg (Same as DB); weight-limited to 302 Srs MTOW: 77,110kg
Max payload: 15,013kg
Srs 310:
New Summary: The Bristol Type 175 Britannia is a British medium/long-range airliner built by the Bristol Aeroplane Company with a purpose to connect the British Empire. The Srs 310 is similar to the Srs 305 but with a strengthen fuselage skin and undercarriage, enabling it to maximize its weight and range increases.
Weight less fuel and payload: 42,229kg
Max payload: 15,830 kg
Range w/ max payload: 3620nm
Range w/ 10,659 kg payload: 4530nm
Cargo hold: 910 cu ft
Srs 320:
New Summary: The Bristol Type 175 Britannia is a British medium/long-range airliner built by the Bristol Aeroplane Company with a purpose to connect the British Empire. The Srs 320 provides improved engines, aircraft improvements and aerodynamics. Resulting in increased efficiency and economics over the Srs 310.
MLW: 62,142 kg
MZFW: 58,059 kg
Weight less fuel and payload: 42,470 kg
Payload:
Max: 15,589 kg (ZFW-limited)
Range:
w/ max payload: 3620nm
w/ 10,432 kg : 4530nm
Cargo hold: 910 cu ft
Talentz
Sources:
https://www.flightglobal.com/FlightPDFArchive/1960/1960%20-%202674.PDF (https://www.flightglobal.com/FlightPDFArchive/1960/1960%20-%202674.PDF)
http://www.bristol-britannia.com/p/britannia-types.html (http://www.bristol-britannia.com/p/britannia-types.html)