You reduce, reuse, and recycle all at once.
As for the math, it's pretty simple, grab a calculator and do it for all the calibers you have (or soon will have)
You will quickly pay for reloading equipment if you shoot anything beyond the 9mm, the more obscure the caliber, the quicker the savings add up. I paid for my reloading equipment through cost savings about once or twice over now, at least. Hunting cartridges stack up the savings very quickly and is primarily why I got into reloading. I do load a lot of pistol rounds, but the big dollars are saved on the hunting rounds that run about $1.50 each retail.
Now, back to the loading bench....I wish, I'm at work, into the factory I go, your computer chips need some quality inspections, and I'm that guy.
cheers and good luck on your endeavours, it's a hobby, don't expect to save much, there's lots of toys...uh hm...I mean tools...to buy to make things go smoothly.