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this process was done one a lathe using a "sinusoidal rib-cutting cam arrangement". If I understood it right, the ribs are "copied" from a cam plate (which is mounted on the lathe) to the projectile. You will find a detailled description in "United States Artillery Ammunition - The American Machinist" on page 64/65.
The old Picatinny and DST manuals used to have detailed examination of rotating band seats for use as ID features in frag analysis. Every round had very detailed drawings - of course due to the timeframe 95% were on Warsaw Pact or Chicom countries.
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