Military once-fired Lake City brass: 7 cents
Hornday 55 grain FMJ: 9 cents
W748, 26 grains: 7 cents
CCI #41 primer: 3 cents
Total cost: 26 cents per rounds, not including equipment.
As a comparison, you can buy Federal XM193AF 55g FMJ ammo for 37 cents per round.
So you save about 11 cents per round.
A very basic reloading set up with Lee equipment and dies is going to cost about $200-250, depending on how you accessorize, so that means your break even point may be around 2500 rounds. I am using Dillon equipment, so I figure arounnd 10,000 rounds as break even if I only loaded 223 on it.
You will find you will save money faster if you are reloading cartridges that are not as common as 223.