I can't give you any hard facts, but I can offer some info. The USS Lagarto was fitted with a second 5"/25 gun in December 1944 and also had her internal stores re-arranged and carried 220 rounds of 5".
The following is from the war patrols of the USS Razorback.
War patrol 3. One 4" deck gun, one 40 mm and one single 20 mm gun.
Total 4" rounds fired - 88, mxture of H.C. and Common.
Total 40mm rounds fired - 368 H.E.I. and H.E.I.T.
Total 20mm rounds fired - 840
War patrol 4.
No contacts, total 20 mm rounds fired - 870 (against 4 mines).
War patrol 5. Fore and Aft 5" deck guns, single 40 mm and twin 20 mm gun.
Total 5" rounds fired - 73
Total 40mm rounds fired - 292
Total 20mm rounds fired - 1260.
The 5th war patrol states describes the above 5" usage as 'Over half our five-inch ammunition' and he then goes on to say:
My face is a bit red regarding five-inch ammunition. Had counted heavily on being able to close any battle surface targets, without difficulty, to good 40mm and 20mm range. We sacrified two torpedoes for as much more of this type ammunition as we could carry; we could use move five-inch now. I'd give a lot for a gun scuttle too. Certainly didn't expect every inter-island sea-truck to be armed.
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