Estimating Friesland's 120 mm ammunition supply

How many 120 mm rounds did a Friesland-class destroyer carry?

Roughly 2,000 rounds in total, though this is an estimate from memory, with no confirmed specification.

Four 120 mm guns in two twin mounts initially suggest an allowance of 250 rounds per barrel, or 1,000 rounds in total. A stated firing rate of about 42 rounds per minute per barrel prompts a larger estimate because that allowance would support only a few minutes of sustained firing. The estimate moves toward roughly 2,000 rounds, but this remains a recollection rather than a confirmed Friesland specification. Clarke draws on his visit to the Swedish Småland, recalling shells stored throughout the ship and human chains moving them toward the automatic handling system. That experience informs the estimate while leaving the actual Dutch allowance uncertain.