Reduced Charge - 21 lbs. (9.5 kg) SPDN
Reduced Flashless Charge - 22 lbs. (10.0 kg) SPDF

Reduced Charge - New Gun
   AP Mark 35 - 2,050 fps (625 mps)
   HC Mark 39 - 2,225 fps (678 mps)

1) The HC Mark 39 Mod 0 projectile was a half-caliber longer than those rounds used for earlier guns.  This projectile body was a "universal" type designed such that it could be loaded with HC, WP, Illumination or Window fillers.  The HC rounds could be used with Point Detonating (PD), Mechanical Time (MT) or with proximity (VT) nose fuzes.  When used with PD fuzes, they were considered to be HC rounds while those with MT and VT fuzes were considered as AA rounds.

2) The sources listed below differ as to the barrel life.  I have chosen to use the figure given in "World Naval Weapon Systems 1991/1992."  A 105 lbs. (47.6 kg) HC round fired at 2,665 fps (812 mps) was equivalent to 0.71 ESR, the 130 lbs. (59.0 kg) Target round at 2,050 fps (625 mps) to 0.21 ESR and the 105 lbs. (47.6 kg) Target round at 2,300 fps (701 mps) was 0.21 ESR.

3) The cartridge cases were sealed with cork plugs which extended about 2.5 in (6.4 cm) past the mouth of the case.

4) Mark 4 was used for Full Charges while the Mark 4 Modified was used for Reduced Charges.

5) Some SPD cartridges had flashless pellets added which gave them a "reduced" flash.

1) These mountings had the guns individually sleeved.  RPC was fitted as completed.  The train and elevation rates of these mountings were similar to those for the 5"/38 (12.7 cm) twin DP mountings.

2) This turret had one projectile ring, but the ring had two tiers, one for each shell flat.  Each tier was set up to stow 288 projectiles.  In addition, fixed stowage capacity was 106 projectiles at the upper level, and 124 at the lower.  Some sections of the upper flat were hinged so that they could be swung out of the way when the lower flat was in use.  Shells were stowed on three decks of the rotating structure with the hoists running from from the two upper levels and the live shell ring on the uppermost.  Both shell and cartridge hoists ran directly to the gunhouse.  The projectile hoists brought the projectiles to a point adjacent to the gun slide.  The projectile was manually loaded into the projectile tray and the powder case was mechanically loaded into the powder-case loading tray.  The projectile tray drive unit then drove the projectile tray and fuze setter head aft towards the rear of the slide.  The powder-case crosshead, which was mechanically linked to the case-stop drive, engaged the base of the case in the powder-case loading tray.  The case stop drive for most of this operation was set to function as a braking unit; thus the projectile tray drive unit during most of its stroke aft drove the projectile and powder case against the braking effort, exerted through the powder-case crosshead, of the case-stop drive unit.  This kept the projectile’s nose firmly inside the fuze-setter pot during this movement aft and the nose fuze was set during this operation.  At the end of this stroke the complete round was delivered to the traverse carriage loading tray in the traverse carriage, which moved transversely across the slide.  The traverse carriage was driven by a drive unit near the rear of the slide and had two trays, one for loading the next complete round and the other to receive the empty cartridge after the gun fires.  The traverse carriage had two positions; one with the empty case carriage behind the gun breech and the other with the complete round carriage behind the gun breech.  Rammers were attached to the end of the slides.

3) These turrets were powered by electric motors with hydraulic drive gears.  Training motors were 200 HP while the elevation motors for each gun were 15 HP.  Each gun had a 15 HP motor which operated both the breech mechanism and the rammer, which was attached at the rear of the slide.  Each shell hoist was powered by a 5 HP motor and each cartridge hoist was powered by a 10 HP motor.  The live shell ring was powered by a 10 HP motor.

4) Manning was twenty-one crewmembers in the gunhouse, ten in the turret officer’s booth and eleven in the gun house.  This was made up of eleven turret controlmen, three gun-laying operators, three gun operators, two hot-case men, and two projectile loaders.  The eleven turret controlmen were organized as follows:  The turret officer, the turret captain, the talkers, the radar operators, computer operator, and two sight setters.  The checker, a member of the crew in training operations only, does not man his station in battle action.  The three gun-laying operators are the right and left pointers, and the trainer.  The three gun operators are the two gun captains - one for each gun - and the gunner’s mate repairman, stationed in the turret officer’s booth and charged with performing general maintenance of the gun control equipment.  The two projectile loaders were located at the loading tray, one for each gun.  They operated the fuze setting indicator-regulator when the fuze setting system is in manual control.  The two hot-case men were located one on the outboard side of each gun near the case ejector.  At the lower levels, the same crew of seven operates on either the upper or the lower ammunition flat.  This consists of a petty officer in charge and one projectile loader and two passers for each hoist being served.  The loaders merely shove projectiles into the hoists, which start automatically when loaded.  The passers keep the loaders supplied; they also operate the projectile ring as required.  At the powder-handling room level, four powder-passing scuttles admit powder cases from the magazine.  A crew of nine operates in the powder-handling room with six powder passers taking the charges from the scuttles to the powder hoists, two powdermen operating the scuttles at the foot of the hoists, and a petty officer in charge.