The Flinders Cerberus display used to show the deck guns firing, big guns that made bigger noise. I used to be able to hear the 4.5 inch turret from over 20k's away.
They would fire multiple Bofors, 40mm AA gun, the 4.5 inch deck gun emplacement, and my favourite, the 50 cal, due to me standing only a few feet away with cartridges flying around my feet. I loved that shit, I bet it's too dangerous these days in our bubble wrap society.
Quite often they had to temporarily stop firing, due to fishing boats putting into the firing range, as they were shooting at a floating target. Also the AA and 50 cal would fire at a Cessna towing a target, you would have to be mad to fly that plane. Fond memory's.