There is something that I have been wondering about when taking long shots where some slope angle is involved. It involves the turret adjustment in MOA to compensate for the slope angle.

If I tilt my scope at a 20 degree angle, and adjust my scope 25 MOA. Then I am getting 25 MOA of adjustment perpendicular to the slope plane, but I am only actually getting 23.5 MOA of adjustment in the vertical plane.

Now my Exbal program will give me a corrected turret setting for the slope distance. But is this corrected setting only taking into account the slope distance or does it also take into account the fact that the scope is also now at a slope angle?

With the scope being at an angle to the horizontal, the true vertical turret movement should always be different than if the scope was horizontal.

Is this confusing you? because it is confusing to me.

Eg. If I was shooting at say 800 yards, on flat country then Exbal might give me say 26.5 MOA of adjustment.

If the 800 yard distance was down a slope of 20 degrees, then Exbal would give me a slope corrected setting of 24.75 MOA (i.e. for a slope corrected distance of 752 yards).

Now if I punch in the same 752 yards as if it was a flat distance, then Exbal only gives me a setting of 23.5 MOA.

So the question is, where did the extra 1.25 MOA of adjustment come from? Is it a correction for the scope slope?

If this is the case then using an angle cosine indicator and simply reducing the slope distance to the horizontal in the field is sure to give you incorrect turret settings for most long shots at any sort of steep angle.