The laser will only intersect the path of the bullet on the rise and on the fall
This is true only if your laser, like your sights, is mounted above the barrel. The bullet's path is parabolic, rising from the muzzle to reach its peak, and then falling back to earth. If your
Line
Of
Sight (or your laser) is above the barrel, you can be zeroed at 0 (no intercept between LOS and the parabola), 1 (LOS intercepts parabola only at the peak), or 2 distances (typical set-up, where the LOS intercepts the parabola on the rise and the fall).
If your line of sight is below the barrel, you can only zero at one distance. You can pick the distance, but you can only have 1 intercept between the LOS and the parabola.
This subject is further complicated by the fact that your laser, which functions as your LOS, is offset laterally to the right. At distances closer than your zero point, the group will be displaced slightly to the left of the dot. At distances beyond the zero point, it will be displaced progressively further to the right. At 2 zero distances, the group will be as far to the right of the dot as the laser is to the right of the bore axis. At 3 times the zero distance, it will be displaced twice that far, and at 6 times the zero distance, it will be 5 times that far. Consequently, even if you think you are going to use it at 1 yard, you shouldn't zero it at one yard, because at 7 yards that displacement will be significant. If you zero it at 50 feet, you have to be over 100 feet away before this creates a displacement any greater than the distance between the bore axis and the laser.
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