9mm FMJ bullets 1K/$77, 1lb powder/under $20, primers 1K/less than $30, 9mm brass-free if you have been shooting it and keeping it or picking up at the range. So the cost is less than $127 for 1K of loaded 9mm in comparison to your 9mm cheapest $20/100 or $200 for 1K factory ammo. The cost is a little more than half the cost of factory ammo or over a $70 savings every 1000 rounds fired.
The bullets are typically the most expensive item purchased. You can buy 1K of lead cast RN for about $50 or less than $100 for 1/k loaded cast reloaded ammo. If you start casting your own then even less than half the cost of factory ammo. The largest reloading savings are realized on high dollar ammo 10mm, .44 Magnum or specialty rounds like center fire sub-sonic ammo. I can reload 1K of 10mm barn burners for less than $160. Georgia Arms will sell you reloaded 1k of 10mm for $390 and it is not “barn burner” ammo.
The bottom line is you don't really save money; you just shoot a heck of a lot more!
Buying my supplies in bulk , I am down to about 11 per hundred rounds of 9mm shooting FMJ with decent powder. Plus no tax. A buddy of mine and I split it all and that made the set up more cost efective. We each shoot 200+ rounds a month, sometimes more. I should have done it 20 years ago, and it is only time till we have issues with supply again. And yes you will shoot more, and not feel guility abou it.