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"The "fins" impart little or no spin to the projectile; their purpose is to decrease the bearing surface of the slug to the barrel and therefore reduce friction and increase velocity."
I don't think slugs work that good if you need them to spin, a slug type bb would have a lot more area touching the barrel, lose more energy, give random results.
The cup thing, some sabot bullets work like that, but the projectile that flies in air will be a bb, and the gyroscope effect won't have much good effect on it, just the bullet shape is enough to increase accuracy and speed, because of better aerodynamics.
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