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Originally published on:
Model Shipwrights

3 inch Deck Gun

Gun Characteristics…

Designation Weapon: 3"/50 (7.62 cm) Mark 22
Mountings: Marks 27, 33 and 34
Ship Class Used On: Many USN ships 1946 through 1990
Spanish Destroyers and Frigates
Norwegian Oslo class frigates
Date Of Design: 1945 (gun barrel designed in 1941)
Date In Service: 1948
Gun Weight: 1,760 lbs. (798 kg) not including auto-loader
Gun Length oa: 159.7 in (4.055 m)
Bore Length: 150.3 in (3.816 m)
Rifling Length: 126.1 in (3.204 m)
Grooves: (24) 0.03 in deep (0.76 mm)
Lands: N/A
Twist: Uniform RH 1 in 32
Chamber Volume: 217 in3 (3.56 dm3)
Rate Of Fire: 45 - 50 rounds per minute

Ammunition…

Type Fixed
Weight of Complete Round AA VT Mark 31 Mod 1 24 lbs. (10.9 kg)
HC Mark 27 Mod 1 24 lbs. (10.9 kg)
ASP M78 24.4 lbs. (11.1 kg)
Projectile Types and Weights AA VT Mark 31 Mod 1 13 lbs. (5.9 kg)
HC Mark 27 Mod 1 13 lbs. (5.9 kg)
ASP M78 13 lbs. (5.9 kg)
Bursting Charge HC 0.74 lbs. (0.34 kg) Cast TNT
AA VT 0.54 lbs. (0.24 kg) Cast TNT, Comp. A
ASP M78 0.77 lbs. (0.35 kg)
Projectile Length HC and AA (including nose fuze) 12.13 in (30.8 cm)
ASP M79 11.9 in (30.2 cm)
Complete round HC 34.74 in (88.2 cm)
Complete round ASP M79 33.6 in (85.3 cm)
Cartridge Case Type, Size and Empty Weight USN
Mark 7 - Brass, 7.62 x 584 mm, 7.0 lbs. (3.18 kg)
Mark 9 - Steel, 7.62 x 584 mm, 6.54 lbs. (2.97 kg)
Other Countries N/A
Propellant Charge 4.0 lbs. (1.81 kg) SPD or SPDN
Muzzle Velocity 2,700 fps (823 mps)
Working Pressure 17.0 tons/in2 (2,680 kg/cm2)
Approximate Barrel Life 2,050 rounds
Ammunition stowage per gun Typically 200 to 300 in ready use lockers with another 1,200 rounds in magazines

Range...

Elevation Using 13 lbs. (5.9 kg) AA Shell
Range @ 45 degrees 14,600 yards (13,350 m)
AA Ceiling 30,400 feet (9,266 m)
Note: Time of flight to 6,000 yards (5,500 m) was 12 seconds for a +5 degree elevation.

Mount and Turret Data...

Designation Single Mounting: Mark 34
Twin Mountings: Mark 27 and Mark 33
Weight Mark 27: 31,435 lbs. (14,259 kg)
Mark 33: 32,400 lbs. (14,696 kg)
Mark 34: 17,000 lbs. (7,711 kg)
Elevation: -15 / +85 degrees
Elevation Rate: 30 degrees per second
Train: 360 degrees
Train Rate: 24 degrees per second
Gun recoil N/A

Sources...

Source for technical data Naval Weapons of the World

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About Frederick Boucher (JPTRR)
FROM: TENNESSEE, UNITED STATES

I'm a professional pilot with a degree in art. My first model was an AMT semi dump truck. Then Monogram's Lunar Lander right after the lunar landing. Next, Revell's 1/32 Bf-109G...cried havoc and released the dogs of modeling! My interests--if built before 1900, or after 1955, then I proba...