In places where there are strong gun laws, like Queensland, you have offences relating to the weapon, separate laws for damaging the building and circumstances of aggravation if you do some real damage with risk of loss of life

WEAPONS ACT 1990 - SECT 78 Weapons not to be discharged or operated - a fine- but also usually, a range of offences related to use, possession, storage of the weapon and ammunition

CRIMINAL CODE 1899 - SECT 69 Going armed so as to cause fear (1) Any person who goes armed in public without lawful occasion in such a manner as to cause fear to any person is guilty of a misdemeanour, and is liable to imprisonment for 2 years.

469 Wilful damage (1) Any person who wilfully and unlawfully destroys or damages any property is guilty of an offence which, unless otherwise stated, is a misdemeanour, and the person is liable, if no other punishment is provided, to imprisonment for 5 years.

Punishment in special cases 1 Destroying or damaging premises by explosion If— (a) the property in question is premises; and (b) the destruction or damage is caused by an explosion; and (c) either— (i) anyone is in or on the premises when the explosion happens; or (ii) the destruction or damage actually endangers anyone’s life; the offender commits a crime. Penalty— Maximum penalty—life imprisonment.

but what you will find is that this sort of activity rarely happens randomly- usually there is a relationship between the victim and the attacker- so something related to stalking, extortion (demanding money with menaces) etc. And those all carry heavy possible penalties. (5 years, 7 years etc)