Jeff -
Again, good pix. Would the vcr capture the round if it were pointed up a bit? When I shoot (16-20-24oz soda bottles, beer can, and 4.5" calibers) usually one can see the round when standing right behind the piece. (Of course with the heavier charges going out 1000 yards or who knows how far, the round is just a blur at first and disappears fast.
It's fun to hear the 7-1/2 lbs of concrete come ripping down through the trees as well.
I'll bet your times of flight are lengthening too.