Yep, my actual experience from sighting-in at lower elevations and then shooting at high elevations is that 100-yard point of impact will be unchanged (because 100 yards isn't far enough for thinner air to affect it noticeably), but longer-range POI will be higher.
And yes, computer predictions of longer-range POI will be close--if the ballistic coefficient input for the bullet is realistic. Not all are for really long ranges, but for "normal" hunting ranges will be close enough.
This has been my experience as well.
