With heavier rounds you have better potential for more range over airsoft, it's the deformation of the round in flight that really holds you back. I really do think you'd get a lot better range and accuracy with backspin as long as you could stop the rounds from deforming so much.
We're using tiny 6mm pellets that weight 0.30g and we're sending them very accurately out to 260ft.
Would be a matter of mass vs drag, but you'll never send a low velocity spheroid as far with rifling as you will with hopup. The rifling only stabilizes it axially to a limited extent so it doesn't tumble in flight. Hopup has the effect of stabilizing a spheroid and making it lift at low velocities.
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