Jon Milan saw yesterday's nice shooting, and sent in the most appropriate response:
Brian,
You can check out the lead photo on my site -- the firing of a rebuilt Crimean War cannon.
MilanImages.com
The absolutely uncropped version is at MilanImages.com/Bullseye.html -- the only photoshop change is a mild "unsharp mask".
Shutter released at about 1/10th second after the massive "boom".
The particles you see flying are burnt toilet paper.
The shot's particularly impressive when enlarged to at least 3' by 4'
:-)
Jon