If you buy or borrow a recent reloading manual (Speer, Nosler, Hornady, Sierra) it will have a clear description of the reloading process. You will need something to de-prime and resize your cases. Then trim them to length and de-burr. Then place an accurate charge of powder. Then seat the bullets. Normally, you buy powder by the pound (7,000 grains), and primers and bullets usually (not always) come in packs of 100. So, if you said you are only planning to load for 338 LM, and you only plan to shoot 60 rounds per year, it will take you a very long time (10 or more years) to get to the point where basic reloading tools (single stage press, dies, trimmer, caliper, scale), powder, primers and bullets are paid for by savings over buying factory loadings. There is a small chance that you will immediately stumble across a much more accurate load than you can buy, for your rifle, but plan to go through many rounds to discover that "magic" load. And you already have brass that's been fired in your rifle, right? Because new 338 LM brass is going to set you back $3 to $4 each.
Many of us started reloading with a "basic" Lee Loader - $25-ish lets you make rounds that go "bang". You'll get hooked. Then you'll want to get more accurate in dispensing powder and will get a scale. Then a bulk dispenser/powder measure to speed that up. Then a press so that you can full length size. An annealer to re-juvenate the brass - and so on. It is a hobby all in its own right, but I have never successfully "saved any money" by reloading - shot lots more, have literally several hundred pounds of powder, brass, bullets, primers waiting to get used up, which required more rifles / cartridges to try which required more powders, bullets, dies, and then more storage space and then more work space and so on it goes. Great game it get involved in, but I do not buy into the "saves me money" story...