Mike it looks to me like you have a peep on that Knight? Is it a Williams?
I like to explode water filled milk jugs my self. Much easier to pick the trash up than the clay birds. They also take them at the recycle center although it raises eye brows
I usually buy a couple buckets of golf balls for our farm shoot which will be coming up soon as the hay is being taken off right now. They are center fire fodder and shot gun too. Some of them explode with rubber bands all over the place.

Al