If you wat proof that spin is not needed on a VERY nose heavy projectile just watch a badminton game. The shuttle cock actually must invert with each swap and does not spin and yet is still very accurate. This is the same physics in play with rifled slugs. They could have sold them as "grooved" slugs to prevent "excessive swaging" But that just don't sound as cool as rifled slugs when selling to us gunners.
Brent
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