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It would really help if you checked who posted what, and did some easy googling. If you check the Navweaps entry on the RN/RCN 3"/70, you'd see that 1) the 3"/70 demonstrated 120 rpm/barrel and 2) it was used in peacetime with frangible pins (aluminium vs steel) in the feedtrain, which were to be replaced in wartime. So peacetime RPM figures don't necessarily apply
