Originally Posted by fishonnw
Sorry for my lack of knowledge on powers. However an earlier post says the scope will only be accurate on the highest setting. As powers increase will point of impact change with higher powers. If I bought a 6.5 - 20 and I used the scope in a hunting application on 10 power would the point of impact be different on 20 power? In my opinion hunting situations will not always allow for the higher powers. Sounds like this topic can open a can of worms.
Only the ballistic reticles. The center crosshair should remain on the same point, however other aimpoints will change with different powers. Some of the very expensive scopes are FFP (first focal plane) and this means that the reticle will change sizes to match the change in magnification; in this case, all the aimpoints will impact in the same place regardless of the magnification.
Most common scopes are SFP (second focal plane) and the crosshairs and entire reticle don't change size as you change the magnification, so every aimpoint except the center crosshair will move on the target as the magnification is changed.
Hope I explained that well enough to be understood, sometimes my explanations get people more confused (normally just my kids when I try to explain math to them