The change from 120 mm to 127 mm amounts to seven millimetres, yet introduces a separate ammunition requirement. An improved 120 mm weapon is proposed as an alternative that could retain ammunition commonality and simplify fitting newer guns to older ships. The larger calibre is challenged because the modest increase in bore does not, by itself, establish enough benefit to justify those logistical costs. This is an argument for standardisation across the fleet, with the proposed improved gun remaining hypothetical.
Notable Point · 44:18-45:19
The cost of changing destroyer gun caliber
Moving from 4.7-inch to five-inch guns raises a question about ammunition commonality across old and new destroyers.