I must have been lucky ! I've brought over PLENTY of ammo components in the last 6 months. I have not attempted to bring in loaded ammo but I always label my parcels spot on for what they actually contain ie

550 x .338 Lapua Magnum cartridge cases for centre fire rifle

and have had enquiries from customs in the past but only to do with duty to be paid on larger orders.

Also I am led to believe that components were ok but ready to fire ammo was not which I can understand. I can buy powder or projectiles without a licence in Victoria but I must produce my shooters licence to buy loaded ammo.