For me to reload .223, I bought most of my components 5-10 years ago when you could get primers for $2/100, bullets for $0.09, and powder for $20/lbs.
Components keep indefinitely if you store them somewhat properly, so does ammo...
So for me to load 1000 rounds of .223, what I paid for my stockpiled components costs me about $180.
I know my loads are equal quality to factory loads that are about $750 per 1000 rounds today.
So for me, the cost savings of reloading are something like 75% but that's just because I've waited VERY long before reloading components I've diligently stored away over the years.
That's the neat part about reloading. If you had the intention of doing it and got everything you needed to do it, the longer you put off doing it, the more rewarding it becomes... both financially and as a hobby...