Neat idea...but...I don't know.
Sorry, I don't have one Aussie.
I do have a few questions please about this...
How much is the ammo and brass? Readily available at local dealers everywhere?
How do you load the brass when you can't even find it because it's thrown everywhere?
Who makes the dies?
Is the bullet diameter .500 or .510?
Do you think the name of the cartridge has anything to do with how popular it will become?
I really don't see it becoming as popular as the .500 S&W or .17HMR did overnight. Really, those two cartridges seem to have set the standard of new cartridges catching on...everything has to be right, for which both of those...it was.
Sorry for the drift.
I do that sometimes.