Initial set up cost can be from $200-$300 up to infinity, you can get a quality set up for less than $500 for reloading pistol cartridges in quantities good enough to be worth doing, people go through a lot of pistol cartridges, a lot more than rifle cartridges, for just about any rifle but an AR anyways!
Here's a good place to start: http://www.brianenos.com/forums/index.php?showtopic=664

Here's a good place to start: http://www.brianenos.com/forums/index.php?showtopic=664