Jimmy D,
The hailstorm (and possible F1 tornado) that hit Melbourne's eastern suburbs of Croydon, Mooroolbark, and Mt Evelyn (1982 or 1983), had giant hail, from vivid memory - I was at school in Mt Evelyn when it hit - the stones were larger than baseballs - the largest live stones I have ever seen (even the Rolling Stones - lol).
Big Pete.