With automatic shell handling and loading, a fire rate three times greater than that of previous 8" (20.3 cm) guns and coupled together with the use of "super-heavy" AP projectiles, these weapons made the Des Moines (CA-134) class the most powerful heavy cruisers ever built.

United States naval gun terminology indicates the gun barrel had an internal diameter of 8 inches (203 mm), and the barrel was 55 calibers long (barrel length is 8 inch × 55 = 440 inches or 36.6 feet or 11 meters). [3] These built-up guns weighed about 30 tons including a …

United States naval gun terminology indicates the gun fired a projectile 8 inches (203 mm) in diameter, and the barrel was 55 calibers long (barrel length is 8 inch × 55 = 440 inches or 11 meters). [3]

Shortly after the Oregon Citys were ordered, a startlingly different 8-inch/55 gun became available, one that used semi-fixed ammunition and could repeat firing cycles without human assistance. This was the Mark 16, which required an expansion of the Oregon City design.

mk16是一种典型的二战风格的三联装舰炮，正面装甲厚度达203毫米，三联装炮塔的总重量高达451吨。 而MK71型舰炮的炮塔大量使用铝合金，整个炮塔旋转部分（不含身管）的重量只有7.8吨。

Turret General Arrangement, Longitudinal Section Sketch from "OP-1180, 8-Inch 3-Gun Turrets Main Armament For USS Salem Class, Turret Description And Operation, July 1947"

针对重巡8英寸主炮射速不足的问题，美国开发了这种自动装弹机的203主炮，这种主炮的射速是之前型号的3倍，达到了10发每分钟左右。 缺点是由于采用全自动状态，所以炮塔重量很大。 美国 8"/55 RF Mark 16 是美国海军第一种用金属药筒替代丝绸药包的8英寸口径火炮。 配合弹药的自动装填系统，这种火炮的射速比 以往的8英寸火炮 快了三倍，再加上使用 超重弹，使得装备这些火炮的 德梅因 级成为世界上火力最强劲的巡洋舰。 这种大口径自动炮的设计在实战中被证明是可 …

8吋55倍徑艦炮 （英語： 8"/55 caliber naval gun，讀音：Eight-inch-fifty-five-caliber）是 美國海軍 構成其 重巡洋艦 和首兩艘早期型 航空母舰 時所搭載的8英寸（203.2毫米） 艦載 主炮。 美國海軍火炮術語表明，該艦炮發射直徑為8英寸（203.20毫米）的炮彈， 炮管 長達55 倍徑 （即是炮管長度為8英寸×55＝440英寸、36.6英尺、或是11公尺）。 [3] 該型 筒緊身管 （英语：Built-up gun） 火炮重約30噸，由襯管、主管、套筒和五具 箍 （英语：Hoop gun） 和所組成。 向下擺動的 …

203mm/55 Mark 16 Mod 0. 配备自动装弹机，采用半定装式弹药，结合了8英寸炮火力和6英寸炮射速的美系重巡炮顶点，装备于三艘德梅因级巡洋舰。

With automatic shell handling and loading, a fire rate three times greater than that of previous 8" (20.3 cm) guns and coupled together with the use of "super-heavy" AP projectiles, these weapons made the Des Moines (CA-134) class the most powerful heavy cruisers ever built.