As a new shooter one of the critical concepts that one learns about is Natural Point of Aim (NPA). Where the crosshairs line up perfectly on the target. Currently I'm shooting at .22LR rifle (with scope) off sandbags (a Caldwell Dead Eye set) at the local shooting range. I'm a new shooter looking to improve basic skills at the moment. So I get down to the range, setup on the bench and....the crosshairs just line up on the center of the target!!!!
Happened to no one ever. Well, at least not myself.
So what is the correct way of maneuvering the cross hair around?
My rather limited knowledge so far:
Left / right:
Do - move myself on the seat (various NPA articles talk about using your skeleton, not upper body muscles);
Don't - cant the rifle, move my head only, use upper body.
Down:
Do - squeeze the rear bag;
Don't - life the stock by moving my shoulder 'up' and causing the rifle to be less supported by the rear bag.
Up:
And this one gets me - what do you do when the crosshair is lower than your target? Moving the rear bag forward and back on the stock will do it.... Though I was under the impression the best place for the rear bag was inline with where the cheeck/jaw made contact with the stock?
The next question is how to adjust when the target is substantially higher. For example, if I shoot at the 25m target and want to go out to 50m the rifle needs to be higher. So far I've been putting extra sandbags under both front and rear bag (2 under each). This seemed to work better (judging by groupings) than simply putting move sandbags under the front (and nothing under the rear) (three sandbags under front, zero under back).
I
s this the best way or is there something I'm missing? If I go out to 100m will it be like constructing a skyscraper?

Thanks in advance for any assistance.