Boby -
Saving money, although important, is only one aspect of reloading. You can make better ammo because the ammo you make are loads worked up for your particular rifle. You can also make ammo to fill a niche which is not available from the ammo makers, such as a .30-30 small game load.
If you used bulk .30-30 170 gr bulk rifle bullets it would cost you about 25 cents each, or you could contact Ben Hanuck on this forum for a price on cast bullets. Ben's bullets are probably better, and jacketed bullets offer no advantage at .30-30 velocities. I shot 210 gr cast bullets at 1800 fps in my .30-06 with excellent results.
Let's assume you use IMR 3031 powder. At 27 grs per round that means you get 259 rounds from a pound of powder, or about 11.5 cents a round.
A primer is another 3 or 4 cents.
You should get many reloads from your brass - but lets say conservatively a dozen - which for 100 pieces of brass at about $30.00/1200=2.5 cents.
Your shooting could cost you as little as $14.29, but for easy figuring lets call it $15.00 per 100. The cheapest factory .30-30 ammo I've seen is about $17.00 per 20, or $85.00 per 100.
At that rate you basic reloading package from RCBS would be paid for by the time you loaded 750 rounds. How long it takes you to pay off the investment in reloading equipment depends on how much shooting you will do.