Schroed,
It is always a pleasure to visit with you also; wish we had more free time though.
Your 4.5% error comes out to measuring 1/25th of an inch at 100 yards though. Most shooters, rifles and scopes cannot get that accuracy, let alone the ammo on top of that. A lot of people I have seen measure groups measure to the 1/4 inch and call it good. Once you get out to 300 - 400 yards where you can see a difference, wind starts to come into effect. I am just saying that the scope adjustment is usually much better than the shooter performance especially down to the second decimal point.
Take care my friend,
Dale