I started reloading years ago because I purchased....at a bargain price....a Win Mdl 71. Even 40 years ago, .348 ammo was expensive and in only one load. Probably amortized half the cost of the reloading kit (Hornady single-stage) with that cartridge alone. Then paid it off when I sold the rifle and loaded ammo to the next happy owner.
Without boring you with my spread sheet (yes, I made one), I'm about even on standard .223 Rem., 30-06 & 30-30. I've saved money to some extent (up to half-price) on the "usual" cartridges: 35, 40, 45 gr. .223 varmint loads; .38 Spl.; .357 Mag.; 45 Colt; medium power 45-70 and .280 Rem cartridges.
But most especially I've saved with "non-standard" cartridges: 7.65 Nagant, .243 Win-40 gr. varmint loads, .44 Spl., heavy 45-70, and most recently, .222 Rem.
I figured out that I could have bought another reloading kit with savings on the several thousand .22 Hornet loads built through the years. The .22 Hornet is ridiculously cheap to load; stupidly expensive to buy at retail. And in the meantime, I got to shoot a lot of sage rats as well.
Significant savings are gained by using mostly Lee dies, which for me, have performed as well as the RCBS, Lyman and Redding dies I've owned.
Left unanswered is the question: "So Mike, would you have owned all those firearms in all those calibers if you hadn't reloaded for all those years?"
To which I would have answered: "Now that's a stupid question....."