I didn't shoot well today at 200-yard with my AR, group got a lot bigger - I think I am hitting a bottleneck or something.

Tell me, how is it possible for anyone to ensure his/her pupil is 100% lined up at the center of scope?

This is a perfect sight picture.




Theoretically it is impossible to place your eye exactly on the central axis from rear lens to front lens, right? So realistically our sight picture is always like this or somewhat so.

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But if you aim like this and fire, which everyone does, you'll miss the target by hitting on its side.

Is there any scope that tells you when you are Dead-On at the Center-Axis?