If I have read and measured your target correctly the group of shots all fall within 36 cm or 14 inches in old money vertically and with one exception 15 cm horizontal 6 inches, There is no indication of point of aim and I understand that for your purpose that's not important.
However you seem to have produced a group of just over 2 moa at a range that most people would be over the moon about, so I can't see how it proves anything. Chances are choosing one of your ladder loads and firing that number of rounds would produce a similar looking target.
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