FAV Guns...

Mark 7 16"/50 caliber rifles 
 

Gun characteristics Designation 16 in/50 caliber (406 mm × 20.3 m) Mark 7 
Ship Class Used On Iowa (BB-61) and Montana (BB-67) classes 
Date Of Design 1939 
Date In Service 1943 
Gun Weight 267,904 lb (121,519 kg) (including breech) 
239,156 lb (108,479 kg) (without breech) 
Gun Length oa 816 in (20.73 m) (breech face to muzzle) 
Bore Length 800 in (20.32 m) 
Rifling Length 682.9 in (17.35 m) 
Grooves (96) 0.150 in deep (3.81 mm) 
Lands N/A 
Twist Uniform RH 1 in 25 
Chamber Volume 27,000 cu in (0.44 m3) 
Rate Of Fire 2 rounds per minute 
Note: The primer cartridge can be either electric or percussion fired. 
Range 41,622 yards (38.059 km or 20.55 nm) with nominal 660 lb (300 kg) powder charge 
Muzzle Velocity 2,690 feet per second (820 m/s) 

Shell 
AP Mark 8: 2,700 lb. (1,225 kg) 
HC Mark 13: 1,900 lb. (862 kg) 
Nuclear Mark 23: 1,900 lb. (862 kg) 
Caliber 16 in (406 mm) 
Muzzle velocity AP: 2,500 ft/s (762 m/s) 
HC & Nuclear: 2,690 ft/s (820 m/s) 
Maximum range 41,622 yds (38 km)