Easy math I tell anyone asking about reloading...
"Reloading doesn't save me a dime, it just lets me shoot twice as much than buying factory ammo."
I apply this rule to any ammo i shoot... NRA Highpower, Local Matches, and plain old plinking ammo.
i.e. If you are buying WWB for plinking, I just generalize that instead of spending 14.99 for a box of 100 9mm... I can just reload 200 rounds of quality comparable to WWB.
Your normal ammo budget will be converted to your reloading budget, (save some $$ for buying 22LR!)
I use this rule of thumb as advice, since shopping habits for everyone is different, bulk buying is where you see the most savings, but beginners typically purchase smaller quantities(1lb of powder, 1k of primers, 500 bullets). I'd hate to see a beginning reloader discouraged that they aren't producing 9mm match ammo at the 10-13 cents a bulker buyer is.