Re: sun on rifle changing poi at 950 yards.
What direction was your target: N, S, E, W ? The different angle of the sun relative to your target and your scope might have caused this change. Say your target was due South, at 8:30am, with the sun at your 9:00 East. By 4:30 the sun has moved to your 3:00 west, this will cause you to view the target differently. It may appear to be to the right, when it is in the exact same place that it was at 8:30 am. The different angle of incidence of the light coming from your target causes you to see it in a different position than it actually is. This may account for the horizontal error. Depending on the direction of your target, this could also account for the vertical error. The slight increase in temp had some effect on that vertical though.