Hypersmurf
Moderatarrrrh...
And with the Quick-Loading enhancement from either Magic of Faerun or Arms and Equipment, you can do that for 100 rounds n a row, before having to spend hours reloading the suckers (with fletched javelins or the like, I'm sure)!!
Hmm. Do you still need two hands to reload a Quick-Loading Light Crossbow as a free action?
We might need a couple of Gloves of Storing to make it all work right.
And a Huge Quick-loading Light Crossbow can be reloaded as a free action, while the Heavy Crossbow needs a MEA.
Of course, with an Enlarge spell, the Huge Light Crossbow becomes Gargantuan and still does 4d6 damage...
-Hyp.