Well... I'm no scientist, but i would have to agree with bjjb99 to some extent about the Reynolds number in relation to the aerodyamics of the PB in question.
It was my impression that the discussion was relating to the Paintball that, out of a series of shots would, for no explainable reason change directions in mid flight. Now I ask is did this same change of direction occur with the nylon balls as well as the paintballs in the test firing?
If so then the answer would point towards a issue of aerodynamics to a sphere in flight. If that were so I would rest my case.
It is only my obervations on the paintball field that lead me to this conclusion. that all paintballs are not created equal, no ball is without its own characteristics as I said earlier...To what final conclusion this thread takes toward the determation of "x" a person must discount all other factors...THEN account for the varible characterists of each ball fired.
But then thats what we call science...