The "average" shooter can own class A & B meaning rimfire/centrefire but no semi auto's or pump shottie's and up to 15 in Victoria any more then you need a security system in place plus suitable safe

Class C, special occupation pest controllers/farmers/collectors or due to medical reasons a semi auto/pump shotgun has to be used but you need a doctors letter

Class D,centrfire semi auto pest controllers only/collectors but not working

class H, handguns must be a member shooting club or collector can not be used for self defence or hunting BUT in NT you can use safari operators handgun.

Class E, full auto, mortars,cannons etc you need a dealers licence or collectors but must be rendered not working

but the police can give a licence to someone for any class but at their discretion

cheers
Steve