To get range in any tank, including the tiger, you can manouevre your head position using pg up & pg dn, and then rotate your view downwards using f8 followed by arrow keys. Using this method, you can (in the panzer) elevate the turret to max and still maintain a zoomed in sightline to your target (on level ground).
It is possible, with practice, to hit VBases from such a range that they do not flash with a Panzer and HE shells.
As for gunsights, the red dot is a favourite.
Does anyone remember the singlepoint gunsight?