I was on the IOWA a couple times when she fired full broadside salutes. I have also sat next to arty battalions for weeks on end with constant fire and all of those weeks never added up to one broadside from the IOWA. It was truly one of the most awesome sites I have ever seen
footnotes:
It was advisable to hold on when she fired a broadside as she moved 17 feet sideways in the water upon firing.
One of the turrets had dents in it from where it had been hit by enemy fire during WW2. They could have fixed it but they didn't as a tribute to her service in that conflict.