Re: Me thinks I discovered something
I think the point here is, for instance, filling a case to the neck, as long as it does not spill, and pressures are acceptable, and I am not using Wilson seating die, (of which I have several), but not for every gun I own, and so use a standard RCBS or Redding seating die. In this situation, there is generally a bit of a crunchy feeling as the bullet is seated. Because the cartridge is only supported by the shell holder, and perhaps while seating a flat based bullet, there may be a little misalignment happening, especially if the bullet is not seated deeply.
I don't know if there is run out, in that scenario, never remember checking under that exact set of circumstances? But, in considering it, I can see where it "could" (possibly) happen. I don't normally use a drop tube, or any vibrator action, IF all the powder will stay within the neck, and this is where a bullet might get seated a little catty whompus.
Something to think about.
Good hunting. LB