I can tell you from experience, that a Bradley's 25mm is the loudest thing I have ever heard, at least from the inside of that rattletrap! XD I will never forget the sound of that thing, or the smell of the gas from unzipping the canvas. That smoke would burn your eyes, nose, and the ringing that even earpro could not keep out of your ears... It's a sound you feel as much as you hear. I'd hate to be on the OTHER side of that thing though. I'll never forget you IFV. But I never want to gun you again.
We have quite a few former military members that work at my businesses and they all told me, when that M1 Abrams tank shot off a round, you better cover your ears lol.