A box of plain old Remington express green box was $56 !?!?!?. That is more expensive than Weatherby or Norma ammo!!!!. The next step down the ladder was plain Winchester silver-box for $46.
While the ammo you were looking at is expensive; I think you were comparing a 20 round box of Norma verses 50 round box of Remington.
If you hand load a pound of powder will be $25, brass some where in the $20 - $25 range, primers $3/100, bullets around $15/100. So the cost of getting started will be $5 for powder+$25 for brass+$3 for primers and $15 for bullets. You can get by cheaper than that depending on what you buy the components for to start with. You can buy cheaper bullets some where around $10 - $11/100 for instance. You should be able to get your first 100 loaded for about $.48 to $.50 each. after that it gets cheaper because you can get 5 or so reloads out of each piece of brass. While not cheap by any means, the only other cartridge that can touch it is 223, unless you get into handgun rounds. If you do not hand load then you can get good 223 ammo a little cheaper (but not much else), but if you buy premium stuff, you will pay as much if not more. Shooting is expensive any you slice it and getting worse.