Just for information, if you are Victorian and want to display a firearm over the fireplace etc its a non starter for anything Cat A or B etc, however you are able to put an "Exempt Firearm" anywhere you like. Exempt Firearms according to Victoria Police are-
What is an exempt firearm?
A firearm is exempt from regulation if it was manufactured before 1900 and meets the following criteria:
Handguns – a) its method of ignition pre-dates the development of ‘percussion’* or
b) is a single shot antique handgun
Longarms – a) it does not take cartridge ammunition or
b) if it does take cartridge ammunition, that ammunition is not commercially available.
*Percussion means a means of ignition in a firearm in which metallic chemical compounds or fulminates are
used to ignite the main powder charge.
Examples of exempt firearms
Exempt firearms include pre-1900
muzzle and breach loading firearms
such as flintlocks, matchlocks, wheel
locks, snaphances, caplocks,
inoperable military cannons or field
guns, cannon net devices and remote
controlled model warship cannons.
Regulation and licence requirements
As these firearms are ‘exempt’ from the Firearms
Act 1996, there is no regulation or licence
requirements to purchase, possess, carry and use
exempt firearms in Victoria
Just posting as this doesn't appear to be common knowledge (and I understand is different to other states)