Your accuracy and effectiveness with thrown rocks improves.
Prerequisites: Str 23, Rock Hurling, size Large or larger (goliaths qualify by virtue of their powerful build racial trait).
Benefit: You can hurl rocks weighing 40 to 50 pounds (Small objects) with a range increment of 80 feet. The rocks deal 2d6 points of damage plus your Strength modifier. Rocks have a maximum range of five range increments. Additionally, you gain a +1 bonus on attack rolls when throwing rocks.
Source: Races of Stone, page 141.