You really need to shoot it at 100yds to see what it is doing. At 40 yds it may or may not put you where you want to be at 100. There are a variety of factors involved one of the big ones is how high above the line of bore the scope is positioned, i.e if you aim dead on at 40 yds you still don't know where you will hit till you actually shoot it at 100yds. You could have 3 identical rifles of the same caliber adjusted to hit the same point of impact at 40 yds, if those three rifles have different mounts i.e. one having low scope mounts, one with medium height mounts and one with high mounts all hitting the same spot at 40 yds yet because of the height of the scope differences above the bore they will all have different points of impact at 100 yds. You will just have to shoot it at those distances to find out for yourself.
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