I think I've only seen this once or twice in the last 10 years or so — hailstones being pushed up into a drift line by the waves:
Most of the hailstones were ~4 mm across:
Next, here's a series of photos with marine flora and fauna for context.
With coralline algae (bleached by the sun):
With snail egg capules:
With a small sea urchin spine:
With a springtail (collembolid) on a hailstone (upper left corner)!