Interesting points guys, thanks alot for your input.
The next time I go to the range I'm going to examine this effect further. I think that understanding this more will lead to much less of those disappointing shots when I shoot great groups on paper, and then miss on larger steel targets immediately after. (Different color and shape).
I hate that, I always find that very discouraging. I'm sure I've discovered something that will improve my accuracy at the farther distances.
I'm going to take a bunch of different colored & shaped targets and take notes of where my bullets are landing compared to my perceived point of aim.
I guess I am a little retentive.I know I really need to get a life. But I'm actually really anxious to see the results.