Here 'tis. You can see where the waist was so reduced that the rifling did not have anything to engage.
Revisiting this just now, with a sectioned case, the bullet was of course not actually down on top of the flash hole, but that was a perception when loading them-- as the bullet seated on top of the powder. Seating depth pretty much coincided with case volume coming to zero. I was specifically trying to get 240's to load a little on the shorter side, emulating more or less the Remington 220 sub load's COAL.
Threaded Mode