im with 2muchgun,
ill mount the scope, go to 25 yards and shoot at a good size target like a piece of construction paper or posterboard. i have never been off by more than a few inches, adjust fire (remember @ 25 yards with a 1/4 in per click at 100, each click is only moveing the point of impact 1/32 of an inch or something like that so you will have to really trun the dial so to speak)
then check to see where you are at at 25 yards, adjust fire agian if needed.
go to 100 yards and check, adjust to whatever hold over you want if any.
then i always go back up and check to see what point of impact i have at 50 and 25 yards. then i write this down and keep it in the case. that way if i think that my zero is off i can check real quick at 25 or 50 yards to see if im off at a shorter distance to make sure (sometimes its easier to pace off or even find a place to shoot that distance in a pinch)
one thing to keep in mind is: even that you have zeroed at 100, shoot your rifle at every distance that you would possible engauge your target at. i do it in 50 yard jogs. that way you will know your Point of impact at those distance's. plus it will give you confadance in yourself when the time comes to make the shot, you will know that you can hit your target instead of "i think i can shoot that far"
BRIZ