This is what is called a “mad minute” of Abrams main battery fire. I believe that they are firing Sabot munitions which stroll along at about a mile per second. Not long, but interesting. (turn the sound up a bit too. ) https://www.facebook.com/photo.php?v=10152339719914250
Awesome! We were at the WW2 Museum of the Pacific War in Fredericksburg, TX a while back. The weekend we were there they had live fire demonstrations of weapons used by America and Japan. They fired the WW2 era Sherman tanks cannon (with I think was less than a quarter of actual amount of gunpowder). It was deafening even with the supplied ear plugs. Plus, the concussion about took you out of your seat. Here’s the website for the museum: http://www.pacificwarmuseum.org/