Description
The built-up gun consisted of a tube, full-length jacket, and single hoop with side swing Welin breech block and Smith-Asbury mechanism for a total weight of about 5 metric tons. Some Marks included a tapered liner. A 24.5-pound (11 kg) charge of smokeless powder gave a 50-pound (23 kg) projectile a velocity of 3,150 feet per second (960 m/s). Range was 9 statute miles (15 km) at the maximum elevation of 20 degrees. Useful life expectancy was 900 effective full charges (EFC) per liner.
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