That's why I don't shoot long range. I'm too lazy to carry a target out to 1,000 yards and then go back to shoot. I'd need a nap to get my pulse rate back down.

But as you rightly pointed out earlier - this is just an approximation.

So, if you have a 20 MOA base do you measure the offset from the ocular, crosshairs (and then which focal plane), or objective lens? This is like rocket surgery.