Bowling Ball Mortar at GBR-VIII #2
Here's another video. I couldn't see the ball in flight through the viewfinder, but got a bit lucky. In the original you can see it clearly. Be sure to turn up the sound and make it full screen to appreciate it best!
The ridge in the background is approximately 1,000 yards from the mortar, and we were landing the bowling balls at the top of the ridge. This video was one of the first, and we were still using lighter loads that we used a bit later!