I've been running a Zeiss S3 for the past 2 months. 1 bear hunt and 3 matches with it. I'm pretty rough on stuff and I've had no zero shift taking it all over the place.
I shot an NRL hunter this week and the first day of shooting I took my gun out of the back, threw it on the bipod and set it next to my truck slightly under it to hold off the rain. I have those stupid electric steps you always see d bags with (bought my truck from a grandma) When you open the door they extend. Maybe you see where I'm going with this...
The step smashed into the bell of the scope and sat there with pressure on it trying to go down for about 2 minutes before I realized what I did. Scope still held zero with no issues.
Admittedly... I'm running
@Formidilosus approved UM rings that we manufacture so I know the scope wouldn't slip. But being hit like that with force and held I was questioning it. But it still had no issues and no shift.
Ken