Editing Colorado-class battleship (section)

====Main guns====
The ''Colorado'' class was armed with eight [[16"/45 caliber gun|{{convert|16|in|adj=on|0}}/45 caliber Mark 1 guns]], which fired a {{convert|2110|lb|kg|adj=on}} armor-piercing (AP) shell at a [[muzzle velocity]] of {{convert|2600|ft/s|m/s|0}} and a rate of about 1.5 rounds per minute to a range of {{convert|34300|yd|m}} at a maximum turret elevation of 30 degrees. Development of this weapon had begun in August 1913, using a bored-out and relined {{convert|13|in|mm|adj=on|0}} Mark 2 gun, with the promise of twice the muzzle energy of the [[12"/50 caliber Mark 7 gun|{{convert|12|in|adj=on|0}}/50 caliber Mark 7 guns]] and 50 percent more than the [[14"/45 caliber gun|14-inch /45 caliber]] weapon used on the ''New York''-class battleships. After an initial proof firing in July 1914 and minor changes, the 16-inch Mark 1 was re-proved in May 1916 and production approved in January 1917. When the ''Colorado''s were modernized in the 1930s, these guns were rebuilt per standard navy practice and redesignated 16-inch/45 (40.6&nbsp;cm) Mark 5 and Mark 8.{{sfn|DiGiulian 2008 (Mark 1)}}