Thank for the information guys. I understand why there has not been much research as it requires quite alot of equipment and not to mention time, but I will try to get some work done on it while working on my thesis. I have also been looking into spread of shotgun pellets interestingly since they are supersonic it appears that the front pellets slow down more rapidly(a sphere is about the worst shape for supersonic flight) then the back and collide with each other after leaving the wad.
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