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BigD: As I understand it, the pattern is a function of both velocity and shot size. Since individual pellets are not spin stabilized, air passing around them can create more ballistic error. Faster speeds increase the effect such that individual pellets have a much greater chance of veering off the intended path. Heavier pellets compensate for this because it takes more force to change their direction.
That's part of the reason that local shooters recommended I use 7.5 shot when shooting trap. Since the distances are typically longer, you want a heavier pellet so that the pattern is better at longer distances. With Skeet, you use a 9 because you want as much dispersion as possible given the very close shots.
(is that correct?)
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