Frankly, while cameras are listed to shoot 1200 frames per second, the ugly part of this is the capture is not a lot of dots. Yes, you dismissed resolution but if you wanted to see the shot pellets, that's going to take some resolution.
Try this one. http://www.casio.com/products/archive/Digital_Cameras/High-Speed/EX-F1/
It's still for sale as I check http://www.amazon.com/gp/product/B00155WX90
Looking for camera to film clay target shooters that can capture 1200 dos shot stream from shotgun slowing video to illustrate where shooter is missing clay target. Use for shooting instruction purposes. Does not have to be detailed resolution. Need to determine where shot stream goes as related to clay target.