PANZER22 said:
If the range I am using is only rated at 25 yards can I zero at 25 then move the height of the POI by raising the reticle up X number of clicks to move the reticle where the POI will be considered zeroed at 100 yards. (cross hairs on point of POA of 100 yard target)
Any comment will be appreciated.
Dan
Yes.
However, you will have to know the difference between your POI at 25 yards and your POI at 100 yards with YOUR rifle and YOUR scope and YOUR ammo, be able to convert that to minutes of angle, then dial in the correct number of clicks (and hope your scope has an accurate measurement of clicks per MOA!).
As one example, I typically keep my service rifle zeroed at 200 yards, as that is where the high power matches start. If I want to shoot at 100 yards, I know I can dial in two clicks and be close to dead on. Likewise, when I go from 200 to 300 yards, I need to dial in two clicks the other way.
I keep my M4gery zeroed at 50 yards. It is about 1.5" high at 100 yards. So, if I want to go from the 50 yard zero (POA=POI) to a 100 yard zero (POA=POI), I need to move 1.5 MOA, which is three clicks on the aimpoint (1/2 MOA per click).
As another example, based on the ballistics calculator, an AR shooting M855 ammo zeroed to be dead on at 25 yards should also be on around 350 yards. It should be about 5" high at 100 yards. That suggests that the 100 yard zero is 5 MOA different from the 25 yard zero. If I zero at 25, move my front sight about five clicks (on a 20" A2 style rifle) then I should theoretically be dead on at 100 yards. If I had a scope with 1/2 MOA clicks like my Aimpoint Pro, then I'd have to move 10 clicks (5 MOA x 2 clicks/MOA).
Of course, it is indispensable to verify the zero at actual range and takes notes as to how your actual rifle performs. A lot of rifle/ammo/sight calculations differ somewhat from the ballistics charts, and not all sights have an "as advertised" clicks per MOA. A lot of cheaper scopes which advertise 1/4 MOA clicks actually have 1/3 MOA clicks in practice.
If this sounds like gobbley-gook, come to an Appleseed. We teach the concept of inches-minutes-clicks and how to efficiently make sight adjustments as well as the adjustments to be made at range.
