I wonder about that too - I am really surprised how we have ADI making .223 and 7.62/.308 ammo here in Australia, yet instead of being practically free (at least comparatively, given the overall high price of ammo here) it costs the same as cartridges made in the US or Czechoslovakia
*.
I'm also surprised how staggeringly little some of the gun shop staff seem to know about ammunition. I know there are hundreds of different cartridges out there and there's no way to know about all of them - but even so, the correct response to "Do you have any .303 ammunition available?" is not a look much like one would wear if someone told you their hovercraft was full of eels.
*I know it's the Czech Republic and Serbia now and they're separate countries, but they both make ammo and their brands are both available here so you know what I mean.