American battleship shells adapted as bombs

Did the United States turn battleship shells into aircraft bombs as Japan did?

Yes in broad principle, though the United States developed its own range of heavy armor-piercing weapons rather than copying the Japanese solution directly.

The Americans also developed specialized weapons from heavy naval-shell concepts, although their program followed its own designs rather than merely duplicating Japan's. The short exchange is a useful pointer into the relationship between deck-penetrating bombs and battleship armor-piercing ammunition. It also cautions against treating the Japanese adaptation as unique.