I know you must know this, but for others reading, this also is not a static view, like in a video game, but the sights are 'swimming' around usually in a figure 8 pattern as your heart beats. It is not just a matter of getting a good sight picture, but breaking the trigger when things aren't perfectly lined up, because by the time the mechanism fires and the projectile leaves the barrel you will no longer be lined up. This is worse for air pistol due to the slow velocity of the pellet.
In other words it is not like you are holding a tiny dot in the exact center of a circle, it is a messy blur of trying to hold 3 things in alignment where the front sight is about as big as the entire bullseye (hence why you aim below, so there is white visible, you would otherwise obscure the target entirely.
If you do it well, you are consistently hitting something the size of the period at the end of this sentence from 10 meters away (again, air pistol).
In other words it is not like you are holding a tiny dot in the exact center of a circle, it is a messy blur of trying to hold 3 things in alignment where the front sight is about as big as the entire bullseye (hence why you aim below, so there is white visible, you would otherwise obscure the target entirely.
If you do it well, you are consistently hitting something the size of the period at the end of this sentence from 10 meters away (again, air pistol).