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These guns were designed after World War II for the heavy cruisers of Pr. 22 and Pr. 66. After Stalin's death in 1953 all work on heavy ships was stopped and the Pr. 22 and Pr. 66 Cruisers were cancelled. Work on the turret design was halted at the same time, but it was decided to continue the design of the gun itself for experimental purposes. The prototype was completed in December 1953 and tests were conducted at Rzhevsk until November 1954. Not accepted for production.

Gun Characteristics

Designation 220 mm/65 (8.66") SM-40
Ship Class Used On Pr. 22 and Pr. 66 class Heavy Cruisers
Date Of Design 1953
Date In Service N/A
Gun Weight 52.5 tons (53.5 mt)
Gun Length oa 563 in (14.3 m)
Bore Length N/A
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire 5.8 rounds per minute design


Type Bag
Projectile Types and Weights AP and HE: 388 lbs. (176 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge 206.13 lbs. (93.5 kg)
Muzzle Velocity 3,231 fps (985 mps)
Working Pressure 24.1 tons/in2 (3,600 kg/cm2)
Approximate Barrel Life 600 rounds 1
Ammunition stowage per gun 120
  • ^With such ballistics and working pressures, I would consider the life figure to be on the optimistic side.


Range with 388 lbs. (176 kg) AP
Elevation Distance
Max Range 54,035 yards (49,410 m)

Mount/Turret Data

  • Triple Turrets
    • Pr. 22 (3) and Pr. 66 (3): SM-6
Weight Rotating part of the turret: 656 tons (665 mt)
Total weight of the turret: 719 tons (730 mt)
Elevation -4 / +50 degrees
Rate of Elevation 11 degrees per second
Train 360 degrees
Rate of Train 5.5 degrees per second
Gun Recoil N/A
Loading Angle +5 degrees


Data from:

  • "Entsiklopedia Otechestvennoi Artillerii" (Encyclopedia of Fatherland [Russian] Artillery) by A.V. Shirokorad

Special help from Vladimir Yakubov