As we all know bullet path is an arc rather than straight line, but simpler to diagram as straight line.
Top line represents line of sight through scope as it had when set for 100 yd POA/POI after moving scope to 2" rings.
Middle line is line of sight through scope mounted 1" above bore.
Bottom line represents straight line through bore to 100 yard target.
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X on top line is representation of where the cross hairs should be (again, in perfect world ) after the move. Now, move the rifle so that cross hairs are centered on the target and see where bullet (should) land.
Then take it to the range and find out how far you are off. 
