Crimson Trace Lasergrips are zeroed for 50' at the factory.
Say the gun has the laser mounted about 1/2" to the right of and 1/4" down from the bore. (I made up those numbers. You can measure your CTC grips if you want. The principle is the same.)
That's almost--not quite but almost--exactly where the bullet should impact a target immediately in front of the muzzle and it's obvious why that should happen.
The rest of what follows is simplified but should be reasonably useful.
Between the muzzle of that gun and a target 50' away, the bullet will impact along a diagonal path angled leftwards and upwards. It will become less than 1/2" to the right and 1/4" below, until at 50' it is exactly on target.
From that 50' target to one that is 100' feet away from the muzzle, the bullet should continue along the same diagonal, climbing up and moving left until at the 100' target it should be about 1/2" to the left and 1/4" up.
What's involved, therefore, is that for a range of 33 yards the bullet should impact within a 1" radius.
I'm darned good, says I modestly, but any day I can get that degree of accuracy shooting offhand from a distance of 33 yards is a pretty good day for me. I leave my CTC grips alone.