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Greetings kz11gr.....................this may be of help
not sure about the 3" 5cwt and 3" 10cwt guns...they may be army and not navy.
someone will hopefully make additions/corrections
try looking at 12 pr 18cwt, 12cwt & 8cwt, all nominaly 3in. and 3in 20cwt but not sure if the later was in Naval service then. A quick read of Janes fighting ships of WWI should give a lead.
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