I would give the advantage to the number 8 shot. Pattern density/coverage = more odds of a kill.
As for the 3 dimensional shot cluster: The shot is going so much faster than the target that the whole column has passed through or by the target in an instant, making the pattern results quite two dimensional.
You could do the math on this.
Target is traveling at say, 35 - 50 MPH
Shot is traveling at, let's say 1000 FPS, or 682 MPH
I'm not going to go through the whole exercise, but the target, even at 50 MPH, has moved very little vs. the 682 MPH of the shot.
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