155 mm Gun

155 mm gun

Development of the gun and carriage took place during the 1930’s and by 1938 was standardised as the 155 mm Gun M1 on Carriage M1. The carriage was a split trail design on a bogie unit with four dual wheels. In action the bogie was raised by screw jacks leaving the carriage firmly on the ground. The gun was trunnioned well to the rear and balanced by hydropneumatic equilibrators. For transport the gun could be disconnected from the recoil system and pulled back, the breech being clamped to the trail legs.
In 1943 the guns began to enter British service under Leand/Lease. By the end of the year the carriage had been successfully adapted to take a British 7.2 inch Howitzer barrel. This, with the new Mark 6 gun became the standard British heavy gun in 21 Army Group.


M 1Original design with bushing between breech ring & barrel
M1A1Breech screw threads cut directly into breech ring. Screwed & shrunk to barrel without bushing
M2Breech ring attachment simplified


M1Original design. No other types applicable to British use


Weight with breech mechanism9595 lbs
Total length290 inches
Length of bore274.6 inches (45 calibres)
Rifling48 grooves, uniform Right Hand 1/25
Breech mechanismAsbury interrupted screw, percussion fired
Elevation-1º40′ to +63º20′
Traverse30º right & left
Recoil systemHydropneumatic, variable 35.7 to 65 inches
Weight in action30,600 lbs


Firing standard95 lb HE shell

Muzzle velocity2,800 feet per second
Maximum range25,395 yards


Shell, HE, M101Streamlined shell filled with TNT & fitted with
Fuzes PD M51 or TM M67
Shell, Chemical, M104WP Smoke, FS Smoke or Mustard Gas fillings. The later never issued
Projectile, AP, M112B1Piercing shell with penetrative & ballistic caps
Propelling chargeBase charge plus one increment. Cordite used in British service
The Royal Artillery 1939-45