Could a battleship fire a giant shotgun shell?

Could ball bearings turn a battleship shell into an anti-aircraft or anti-destroyer shotgun round?

In principle, yes, but its effectiveness would depend on fragment size, casing, explosive charge, range, and the vulnerability of the target.

A battleship-scale shrapnel round is possible in principle. Its usefulness would depend on the size of the projectiles, the shell casing, the bursting charge, range, and the target. A dense cloud of fast fragments could threaten aircraft or perforate an unarmoured destroyer across a wider area than a conventional point impact. The idea remains speculative rather than a proven weapon. Its value lies in showing how fragment density and target vulnerability shape an area-effect munition.