Italy
76 mm/62 (3") M.M.I.
Updated 29 December 2007
An OTO-Melara design, this automatic gun was used on Italian ships during the 1960s.  The barrel used a water-spray system for cooling.  The mounting is electrically powered and has a water-tight, splinter-proof shield.

This weapon has been replaced by the 76 mm/62 Compact and SR on modern ships.

Actual bore diameter was 76.2 mm (3.00").
WNIT_3-62_MMI_pic.jpg

76 mm/62 M.M.I. Mountings
WNIT_3-62_MMI_Andrea_Doria_pic.jpg

76 mm/62 M.M.I on Andrea Doria
Marina Militare Photograph
WNIT_3-62_MMI_OM_pic.jpg

76 mm/62 M.M.I.
Photograph copyrighted by OTO-Melara
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Gun Characteristics
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Designation 76 mm/62 (3") M.M.I.
Ship Class Used On Andrea Doria and Vittorio Veneto Classes
Date Of Design About 1960
Date In Service 1963
Gun Weight (tube and liner) 1,686 lbs. (765 kg)
Gun Length oa N/A
Bore Length 186 in (4.724 m)
Rifling Length 158 in (4.012 m)
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire 60 rounds per minute
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Ammunition
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Type Fixed
Weight of Complete Round 27.2 lbs. (12.34 kg)
Projectile Types and Weights All - 13.88 lbs. (6.296 kg)
Bursting Charge N/A
Projectile Length N/A
Complete Round - 35.45 in (90.04 cm)
Propellant Charge 7.85 lbs. (3.56 kg)
Cartridge 76.2 mm x 635.5 mm
Muzzle Velocity 2,789 fps (850 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A
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Range
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 Elevation With 13.88 lbs. (6.296 kg) HE Shell
Range @ 45 degrees 20,122 yards (18,400 m)
Effective Range 8,700 yards (8,000 m)
AA @ 85 degrees 13,200 feet (4,000 m)
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Mount / Turret Data
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Designation Single and Twin mountings
Weight  Single Mounting:  12 tons (12.1 mt)
Elevation -15 / +85 degrees
Elevation Rate 40 degrees per second
Train 360 degrees
Train Rate 70 degrees per second
Gun recoil N/A
Notes:

1) Elevation and traverse are electrically and hydraulically controlled with an emergency manual operation system.  A single crewman is in the gunhouse with three men required to reload the ammunition system.

2) The Twin mount had the barrels stacked vertically.
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Data from
"Jane's Pocket Book 9:  Naval Armament" edited by Denis Archer
"The Naval Institute Guide to World Naval Weapon Systems 1991/92" by Norman Friedman
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