Damage from Boulders

[FocusWolf413]

My friend's glorious and terrifying abomination of a character will have something like a 38+ strength score. He has a light load of 3.2k pounds (correct me if I'm wrong, but 400x2sizex4 is 3200). He wants to use 1 ton boulders as weapons. How would you guys rule this, as a throwing weapon or as a bludgeoning weapon?

I was going to use the telekinesis rules, which state 1d6 per 25 pounds, but I am not sure that doing that is the best option. To be fair, though, 40d6+1.5xstr does seem appropriate for having a massive boulder thrown on top of you.

[Asrrin]

Look at the prestige class Hulking Hurler. Has exactly what you need.

[FocusWolf413]

This says nothing about how much damage the boulders would do..

[Asrrin]

...a hulking hurler depends on brute strength more than skill, he can throw anything (not just weapons) he can lift as a light load. If the item is an improvised weapon, he takes a —2 penalty on his attack roll instead of the normal —4. Use the rules in Chapter 4 of this book to determine the amount of damage the thrown weapon does.

The prestige class is from Complete Warrior, and I believe it's a certain number of dice for a 400lb object plus an additional dice every 200lbs, but I don't have the book handy so I don't know specifics.