Since no two people have identical eyesight, no-one can sight in your gun for you.

Even if the boresighting results in being "on paper" at 100 yards, YOU MUST DO the final fine adjustments yourself. Indeed, it would be wise to fire the first shot at a 25-yard target, and then, IF that first round hits within an inch or two of the point of aim, you can move back to 100 yards and finish adjusting the scope. (I have seen guys who started out trying to sight in at 100 yards, and the first round was NOT on paper -- they shot up their whole box of ammo without ever knowing where their bullets were going. If they'd started out at 25 yards, it is likely the first shot would at least have given them a clue!

If you have to adjust the scope at 25 yards in order to get close to the target, just remember that the adjustment values at 25 yards are only equal to 1/4 what they are worth at 100-so, for example,if you need to move the point of impact 2" at 25 yards, and your adjustments are equal to 1/4" at 100 yards, it will take 32 clicks to move your bullet point of impact those 2" at 25 yards!