Object 257
Tier 9 · ussr · heavy
About
A project of the heavy tank designated IS-7 that was developed in 1945. The vehicle was supposed to feature an electromechanical transmission. Development was discontinued at the documentation design stage. Existed only in blueprints.
Survivability
Hit points
1,800
View range
380 m
Signal range
440 m
Engine fire chance
12%
Armor (mm)
Front
Sides
Rear
Hull
130
130
70
Turret
249
110
70
Gun · 122 mm BL-13-1 A
Caliber
122 mm
Rate of fire
5.31 rpm
Reload
11.3 s
Aim time
2.7 s
Dispersion @ 100 m
0.38 m
Gun arc
5° / 15°
Traverse
26°/s
Ammo
40
Mobility
Top speed
50 km/h
Reverse
15 km/h
Engine
700 hp
Power/weight
13.6 hp/t
Hull traverse
32°/s
Turret traverse
26°/s
Shells
ARMOR_PIERCING_CR
390 dmg (293–488)
225 mm pen (169–281)
HOLLOW_CHARGE
390 dmg (293–488)
265 mm pen (199–331)
HIGH_EXPLOSIVE
530 dmg (398–663)
68 mm pen (51–85)
Marks of Excellencesample size 114 · updated 5/23/2026
1 mark
1,153
avg damage
2 marks
1,449
avg damage
3 marks
0
avg damage