Largest calibre in a quintuple gun mount

What was the largest calibre used in a quintuple or larger gun mount?

The tentative answer is 40 mm, after excluding grouped recoilless rifles and Gatling-type barrels from the definition.

A 40 mm weapon is the tentative answer for a mount containing five or more separate guns. An American tank destroyer carrying several 90 mm recoilless rifles is considered as an extreme example, then rejected because the weapons do not qualify as the kind of turret or mounting being discussed. Gatling-type weapons raise another distinction: several rotating barrels share a firing axis rather than acting as separate guns in one mounting. No larger qualifying example is firmly identified.