Esmith,
I recall at least three threads on this topic in the past week. Search a little through this section of the forum and I'm sure you'll find them.
Honestly, the easiest way for you to determine your cost/savings is to price some components that you would use versus your loaded ammo. It is really simple math (take your cost per casing, charge of powder, bullet, and primer added together).
THE SIMPLE ANSWER: You can save a decent amount on .45ACP, probably not much (if any) on steel cased 7.62x39, and a ton of money on more obscure calibers (.416 Rigby, etc).
Also, read up on the topic a bit... The stickies are a good place to start, but so is a reloading manual. I've only been at it for a couple of months myself (which makes me a novice compared to most folks here), but I've read probably 5 books and over a thousand pages on the topic so far.
NOTE: There is a sticky to a reloading cost calculation spreadsheet in this section of the forum. It might be a good resource for you to use when you start loading and want to do some cost comparisons. I've also made a similar spreadsheet myself (as I didn't notice the posted one originally). Check out the one on this site, or send me a PM and I'll gladly e-mail you a copy of mine.