As others have noted, it depends on several factors. There is a lot of difference in the price of components. Rem or Win brass is a lot cheaper than Lapua brass. Also, you can buy bulk Rem or Win bullets for a fraction of what Noslers, Swift, Woodleigh etc... run. Primers and powders can be less or more as well.

Plus, the caliber can make a difference. Common calibers like you have listed aren't too bad but toss in something like a 6.5x54MS, 9.3x62, 350 Rem Mag etc... and you're talking a different animal all together. And we haven't even touched stuff like the big nitro express double rifle calibers. I used to have a William Evans 450/400 3 1/4 nitro express double and Kynoch factory shells were $11 apiece. After I had the dies, shell holder and brass I could load it for about $5 a round. Still an expensive rifle to shoot but less than half what factory ammo cost. To be honest, most the expense of that rifle was the Woodleigh bullets since 400 gr .411 bullets aren't made by many companies.