Well wait a minute...I thought I saw somewhere on the FN303 information page that the rounds are spun to increase accuracy and distance???
The next question would be that if the barrel wasn't implementing the spin then what was? What was causing the rounds to behave the way they were? I mean, if it were just a matter of weight and no spin was involved then wouldn't a heavier paintball show the same accuracy as the FN303 rounds since we are seeing these results with the lighter rounds? These results would seem to lead to the conclusion that there are forces acting on the ball that are greater than the vortexes we see on a round ball thus pushing the lighter round further off course but not affecting the heavier round.
It sounds to me like there may be something else at work here. hmmmmmmmm.