Navies sharing major-caliber guns and ammunition

Did navies ever share major naval calibers and ammunition with another country?

Yes; Dutch use of Swedish guns is cited as an example of cross-national weapon and ammunition commonality.

Shared weapon supply was possible when one navy adopted another country's gun system. Dutch use of Swedish weapons is offered as a likely example. Common guns could bring compatible ammunition and support arrangements across national fleets. The answer is cautious about the exact case, but it establishes procurement choice as the route to interoperability.