Tinman204 has said a mouthful, especially as regards the handloading.
I started handloading back when I had a $27.50 Mauser 98k and 300 rounds of fired .30M2 brass with WW2 dates. A startup handloading outfit cost the same as about 8 or 9 boxes of commercial 8x57 ammo. I changed calibres to suit my .303 for the price of 2 boxes of ammo. Those values have not changed over the years.
At this time, my collection embraces the last half of the 19th Century and almost all of the 20th. I find that I NEED more than 30 different cartridges, of which only a fifth are still being made. I can turn them all out, match grade, at half the cost, or less, of a box of the cheapest commercial stuff. Some of them, the $10-a-shot stuff, I can load myself for a bit of work and the cost of a single round of surplus 7.62x39. And for shockingly-cheap practise ammo with little recoil and moderate performance and which produces almost zero bore wear, there is always the Harris Load: 11 cents a shot for ANY military fullbore cartridge.
With handguns the disparity is almost as great. I shoot a couple of .455s: buck or more a shot...... except than mine cost me just over a nickel.
Handloading opens up the ENTIRE world of surplus firearms..... and it does it for half-price, once you get the equipment.