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A Pom-Pom question ?
Historically the RN had the Pom Pom developed from early 20s till it was introduced in 1930, later they developed a new HV version with a different shell and none interchangeable gun in 38. (not that that stopped them continuing to make both throughout WW2)
What if they had gone for a larger redesign using the shell and barrel from the 40/56 Bofors ? (available from 37 for the army)(its a much faster shell and larger case but could it be made to work ?)