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Well, if that rifling actually works properly on a plastic BB, the accuracy will improve (assuming your rifling twist is appropriate for BB weight & velocity) -- it's been done with pellet guns, they usually have rifled barrels. Some of them can shoot both pellets and BBs (the copper veriety). While less accurate than pellets, the BBs do gain accuracy compared to normal. (and on a sidenote, don't try that with a rifle you like -- BBs have a copper jacket, much harder than a lead pellet; it causes serious wear to the rifling and accuracy will go to hell in no time.)
As for the shape of the projectile, yes the football shape is more aerodynamic, but the tail induces more drag, so you don't gain anything.
Either way, hopup still gives you more range -- and that's probably what most people are after (specially snipers).
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