[geetarman]

I don't know that it is much of a problem today, but years ago, the mechanical axis and the optical axis were not held to close enough tolerances to prevent POI changes when zooming from low magnification to higher magnification.

I think it is not so much a problem today with name brand scopes. It could be a problem with some.

The only way to tell for sure would be to use a collimator and zero the scope at infinity and "buck" in at 3 feet or so and run the line of sight at various distances and check the parallelism.

The equipment to do that is very expensive.

One way you COULD get an idea is to secure the scope on a bench and adjust it to be zero horizontally and vertically at 100 yards at the highest power.

Then, if you can make sure the scope does not move, change the magnification and watch to see how much vertical and horizontal displacement occurs when changing power.

I am going to guess it will not be much.