Big Horn Barney, I know you asked Rick, however, I can tell you where I got my charts. I have a ballistic program that will give me the MOA list with the print out. If you can's get them anywhere you can send me a pm and I will chart yours. I would need all the info on your round, BC, Velocity, weight, etc. The way the chart works, is you simply range the rodent, look at the chart and adjust the scope for the MOA at the new range. The scope would need to be zeroed at 100 yards initially. In my last shot the range was 462, I checked the chart and set the scope to 5 MOA. Put the cross hairs on him and Bang. Dead rodent. Pretty cool. I am new to the whole theory and I am sure Rick could give more detailed info but i ma a believer

I have always been a firm believer of never playing with scope settings after zero. Well I am not anymore. Works great. As Rick would say, "Dial a Rat". Range him, dial it in and Bang. If you have any questions about it more specific you can PM and I will give you what I have. I PM'd Rick several times when I was making mine. Good Luck
Darren