Gloob (Post 75) is absolutely right
Well, you basically save money right off the bat if you buy a decent setup and say 5k rounds worth of components and lead at a reasonable cost. If you spend wisely, you're already ahead.
But most casual shooters don't buy 5k rounds of factory ammo at a time. And reloading takes a lot of time and space.
For more on this approach to the question, see this thread.
http://www.thehighroad.org/showthread.php?p=7760989
Reloading Cost by the Box
When many people look at the price of ammunition, the thought, "I could save a lot of money if I rolled my own." often occurs.
When you look at the cost of the equipment to get started, that thought often evaporates.
The amount of money to get set up is large. The amount of money to get one box of ammo is relatively small. So, one keeps buying retail.
Consider this, though.
A decent gun costs about as much as 20-25 boxes of ammunition.
A decent reloading setup costs about as much as 12 boxes of ammunition.
Adding a new chambering to an existing loading setup costs about as much as 2 boxes of ammunition
Loading your own saves you about 10% (for ammo that is really cheap to buy retail) to 80% or more (for ammunition that is hard to find or very expensive).
Putting it another way, if you take a given amount of money you can buy
1) 20 boxes of ammunition
or
2) 2 boxes of ammunition, a reloading setup and enough powder, primers and bullets to make 18 more boxes of ammunition.
Either way, 20 boxes of ammo for the same money, but the difference is, going forward, cheaper ammo is behind door number 2. But the rub is that you have to work at keeping the quality of your ammo. The silver lining is that your ammo can be of MUCH higher quality. if you want it to be. And still cheaper.
Consider the cost of getting into handloading by comparing the cost of retail boxes of ammo to the cost of that same amount of ammunition bought as components and including the cost of the reloading gear.
For comparison purposes, I will stipulate that a typical box of (50 count) handgun ammunition costs about the same as a typical box of (20 count) rifle ammunition.
If you take enough money to buy 12 boxes of ammunition and apply it to the purchase of;
A) 2 boxes of store-bought ammunition (so you have the brass which you will re-use) and apply the remaining money to the purchase of
B) A decent press, dies, scale, a few extra small implements necessary to the activity
C) enough powder, primers and bullets to make 10 more boxes of ammunition, (500 handgun or 200 rifle)
you will have spent the same amount of money for the same amount of shooting (12 boxes worth - 600 handgun or 240 rifle) and you may well have some powder left over.
After that, all your ammunition is a fraction of the cost of store-bought (excluding your time, of course, but for some cartridges, you can amortize your time, too and still be saving money; depending on if you count your time as worth $20 per hour or $100, of course. The bonuses of satisfaction, better quality ammo and the independence from retailers are not even addressed here).
This rough estimate applies equally well to bottlenecked rifle cartridges as to handgun cartridges.
The exact figures will depend on local prices, but I expect counting by boxes will be more universal than counting by currency, even in different countries.
Lost Sheep