Very nice, finally a Soviet bomber!
Hopefully Pe-2 will follow someday.
Every good source that I've read on the TU-2 shows that 8300lbs simply won't fit to the aircraft. My guess is that the 8300lbs is a mistake by one author which then got copied over and over again to many "mainstream" "aircraft of WWII-books".
Here's a Soviet source which lists 1000kg as the "normal" and 3000kg as the maximum payload:
(Image removed from quote.)
(It also mentions that the forward firing cannons have 150rpg.)
http://ww2warbirds.net/ww2htmls/tupotu2.htmlhttp://www.tu-2.info/http://ctrl-c.liu.se/misc/ram/tu-2.htmlWhat's being referred to is an overload configuration.
"Bomb load was 1000kg inside the fuselage and 1000kg externally. Tu-2 was often used in overload configuration, carrying up to 4000kg (over 8800 lbs) of bombs."
Empty weight: 7,601 kg (16,757 lb)
Loaded weight: 10,538 kg (23,232 lb)
Max. takeoff weight: 11,768 kg (25,944 lb)
23,232 lbs minus 16,727 lbs would equal 6475 lbs
25,994 lbs minus 16,757 lbs would equal 9,187 lbs