Extending a gun barrel from 45 to 50 calibres can improve range, but the additional pressure accelerates wear. Frequent relining and replacement are easier for a fleet operating close to its home industry. A global navy has to remove worn barrels where ships are deployed, return them home, and arrange replacement barrels in advance at distant stations. That increases maintenance costs and requires more administrative work.
Notable Point · 1:46:39-1:47:46
Longer gun barrels imposed a worldwide maintenance burden
The 45- versus 50-caliber choice links ballistic performance to barrel wear, replacement infrastructure, and whether a fleet operates near home or around the world.