"After chasing for the very best, I came to the conclusion very good to good is good enough and resources are better spent on shooting more."
Very well said, and I agree completely. If that were not the case I could never kill a limit of doves with something as "inefficient" as a .410.
That said, I really think that the initial purpose of this post was to provide proof that setback of pellets in a shot shell does occur, and the percentage of pellets in the load that are deformed increase as the bore diameter decreases, naysayers notwithstanding .......... and not that it necessarily makes huge differences at the target.
SRH