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The Allies almost all used a 76.2mm, though they rounded down and just called it 76mm. Most guns have an extra tenth or so of a millimeter that no one talks about. For example during WW2 the Germans used a 7.92mm Mauser round, but for the sake of simplicity they rounded up and called it 8mm Mauser. I do know that Russia has a 152.3mm gun (or something close to that), but its just called a 152mm.
Kinda weird actually, the more I think about it. Why not just make rounds that are in 1mm increments rather than having these really strange calibers. Bore machining equipment quality maybe?