Reading the numbers
Bismarck’s 38-centimetre guns had a bore of 380 millimetres. Hood’s 15-inch guns were 381 millimetres; Rodney’s 16-inch weapons were about 406 millimetres. The conversions show why apparently different units can describe similar diameters. They do not establish equal shells, muzzle velocities, penetration or rates of fire. The ship profiles identify the sources for each battery arrangement. B08 B09 B10
Why divide the battery?
Bismarck’s artillery trial report favoured divided forward and aft salvos for normal firing. Its discussion explains a practical difficulty with firing all eight guns together: the nearer shell splashes could conceal the farther ones and make observation harder. The report was concerned with seeing where shells fell and correcting the next shots, as well as delivering fire. B08
A salvo is therefore more than a dramatic burst. It is also part of a repeated process: aim, fire, observe and correct. A missed salvo could still provide information if its fall was seen clearly.
What could actually fire?
Rodney’s report describes an intended five-gun/four-gun division. Actual salvos varied with readiness and bearing. A gun could be loaded but unable to point at the target; a turret could bear while one of its guns was delayed in loading. These were distinct constraints. B09
Turret arrangement consequently affected how a ship could fight on different headings. The silhouette’s impressive gun count did not guarantee the same firepower ahead, astern or on either beam.
Keeping guns in action
Prince of Wales’s gunnery report distinguishes a shell-ring jam in Y turret from B turret’s freedom from mechanical defects during the first action. A failure in one mounting did not mean that the entire battery stopped. It also records civilian specialists assisting aboard a ship still gaining experience with its armament. B29
During the final battle, King George V’s captain described useful early radar ranges when smoke impeded observation, followed later by mechanical interruptions in the turrets. Finding the range and keeping guns firing were separate problems. Both reports are currently read through modern transcriptions; their original enclosures still need comparison. B30
Following the shell inside
Calibre and hit reports alone cannot reconstruct the route of a particular shell through a ship. That requires evidence about impact, armour, internal spaces and subsequent explosions. The uncertainty is especially important in Hood’s loss, where the observed destruction and the precise internal mechanism are different questions.
This profile explains the gun system’s operation from selected reports. A full comparison of projectile marks, armour penetration and ammunition handling awaits original technical tables; it would be misleading to turn these limited figures into a ranking of the “best” battleship.