Characteristics of Naval Guns
on
Cleveland Class Ships


Page last updated: 24 September, 2016


Gun Characteristic
6"/47 Gun
5"/38 Gun
40mm/56 Gun
20mm/70 Gun
Designation  6"/47  Mark 16
5"/38 Mark 12
40 mm/56
Mk 1, Mk 2 and M1
20 mm/70
Marks 2, 3 and 4
Date Of Design
1932 About 1932
1941
About 1939
Date In Service
1937
1934
1942
1941 (Mk2)
Gun Weight
13,000 lbs.
3,990 lbs.
Without Breech
Mk1: About 1,150 lbs. (3)
Mk2: (          "            )
M1: 1036.5 lbs. (4)

150 lbs. (with breech)
46 lbs. (without breech)

Gun Length oa.
300 in.
223.8 in.
148.8 in.
87 in.
Bore Length
282.3 in.
190 in.
88.6 in.
55.1 in.
Rifling Length
238.3 in.
157.2 in.
75.85 in.
49.1 in.
Grooves
N/A
N/A
Mk1 & Mk2: (16),
0.0236" D  x  0.220" W
M1: (16),
0.0225" D x 0.220" W
(9) 0.015" D x 0.205" W
Lands
N/A
N/A
0.0892 in.
N/A
Twist
Uniform RH, 1 in 25
Uniform RH, 1 in 30
Increasing RH,
1 in 45 to 1 in 30
Uniform RH, 1 in 36
Chamber Volume
1,470 cu. in.
654 cu. in.
28.3 cu. in.
2.127 cu. in.
Rate Of Fire Rds./Min.
8 - 10
W/o integral hoists: 12 -15
With integral hoists: 15 -22
120 per barrel nominal,
140-160 when horizontal (gravity assist)
450 (Cyclic),
250-320 (Practical)
Working Pressure
18.5 tons/sq. inch
N/A
N/A
N/A
Approx. Barrel Life
750 - 1,050 rounds
N/A
N/A
N/A
Ammo stowage/gun
200 rounds
N/A
N/A
N/A
Range
6,000 yds, at 3.3 ° elev. (1)
9,500 yds, at 10 ° elev. (2)
6,800 yds at 10 °  elev. (5)
3,450 yds at 10 °  elev. (6)
Range
10,000 yds, at 6.5 ° elev. (1)
13,400 yds, at 20 ° elev. (2)
9,300 yds, at 20 ° elev. (5)
4,275 yds, at 20 ° elev. (6)
Range
20,000 yds, at 22.3 ° elev. (1)
16,000 yds, at 30 ° elev. (2)
10,690 yds, at 30 ° elev. (5)
4,650 yds, at 30 ° elev. (6)
Range
26,000 yds, at 44.5 ° elev. (1)
17,200 yds, at 40 ° elev. (2)
11,200 yds, at 40 ° elev. (5)
4,775 yds, at 40 ° elev. (6)
Range
26,118 yds, at 47.5 ° elev. (1
17,400 yds, at 45 ° elev. (2)
11,130 yds, at 45 ° elev. (5)
4,800 yds, at 45 ° elev. (6)
AA Ceiling
48,000 feet
37,200 feet
22,300 feet
10,000 feet





Notes:  (1): With 130 lbs. AP,   (2): With 55 lbs. AAC,   (3): Water Cooled,   (4): Air Cooled,   (5): With 1.985 lbs. HE,   (6): With 0.271 lbs. HE

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