FA Match rounds

These came from a large bag with many early 1960’s FA Match empty de-primed rounds. They all have the same appearance. This shiny neck is obviously some kind of a reloading stage, but which one? I never saw them that shiny.

As to the stage I’d say before case length trim as it looks a=s if the necks were machined for the desired thickness. This would allow any crimp to be evenly applied to a bullet so an even release from the case.

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Competition shooters/reloaders will turn the necks of fired brass from their specific rifle to ensure concentric uniformity and neck thickness. When the neck sizing die is then used which sizes the outside of the bass, the inside diameter of all the necks will be nearly the same resulting in the same bullet seating pressure and thusly closer to the same muzzle velocities and points of impact.
A tighter seated bullet will create a greater pressure rise in the case/rifle chamber and cause a higher muzzle velocity.

Side note, these cases appear to have had to much material removed as you would typically only remove enough to make the necks uniform, removing only “high” spots.