I suspect that come from signed treaties , like Washington or London and same is aplicable for calibers amd tonnage allowed for the different typers of crafts.
Of course there are variations but in caliber for example, was allowed:
152nm- Light cruisers
203mm -Heavy cruisers
381mm-Battleships
406mm-Batleships
120mm-Destroyers
There are variations with 133mm, 150mm, 280mm,320mm,330mm,356mm, 460mm,etc.
In tonnage , 10.000 t was for example the standard for a Heavy Cruiser with 203mm guns.
Last edited by Danelov; 04-10-08 at 02:04 AM.
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