The two relevant barbarian powers to my primary question are
Hurling, Lesser (Ex): As a full-round action while raging, the barbarian can lift and hurl an object up to one size category smaller than herself with both hands or two size categories smaller with one hand as an improvised weapon with a range increment of 10 feet. This inflicts damage as a falling object plus the barbarian’s Strength bonus. This damage is halved if the object is not made of stone, metal, or similar material. This is a ranged touch attack, and the target may attempt a Reflex save (DC 10 + 1/2 the barbarian’s level + the barbarian’s Strength modifier) for half damage. The barbarian may apply Power Attack to this attack as a one- or two-handed weapon, as appropriate.
Hurling Charge (Ex): While raging and making a charge attack, the barbarian may draw and throw a hurled weapon during her charge, gaining the normal +2 attack roll bonus on the thrown weapon attack as well as on the melee attack at the end of the charge. The barbarian must move at least 10 feet before using a thrown weapon and at least 10 additional feet before making a melee attack at the end of her charge. The barbarian must have a thrown weapon in hand or have one hand free at the beginning of her charge. A barbarian must have the lesser hurling rage power to select this rage power. A barbarian must be at least 6th level to select this rage power.
To me this makes it sound as though a medium creature is suppose to be able to draw a small stone and throw it during a charge with these feats. The questions are how large is a "small" stone, how much it would one weigh and how practical it would be to have one slung at your side to be easily drawn?
It also gives the option of throwing tiny stones but then instead of dealing 2d6 plus str dmg it would deal only str damage since tiny stones deal no falling damage which would make the power pretty useless.
Also the hurling and greater hurling powers allow you to hurl objects of your size and one size category larger than you receptively which brings about the question of if you can hurl a rock that you cannot normally pick up if the power says you can (large stones have got to be heavy, 64 times heavier than I small stone I believe) and I'm not even going to try and consider hurling charge with larger than small stones.
