I did a test on mine this afternoon. I’m using a DPMS LR308 rifle and I’m shooting at 100 yards, with a moderately high crosswind.
My scope is an XP50 with the aftermarket dloc mount that I have torqued to 44 inch lbs (spec from manufacturer)
The last time I shot mine on paper and made adjustments to the scope it was approximately 55 to 60° outside which is what the temperature has been for the most part in my area each time I’ve used it until today.
Earlier today it was partly cloudy or mostly sunny and I put my rifle on my dashboard for approximately one hour. I used a digital barbecue thermometer and got a reading of 105° on the receiver when I drove to the bench which is shaded a quarter of a mile away.
Did not start shooting immediately, but when I did I could feel the warmth of the stock against my cheek.
First three shots resulted in this group which should be consistent with my last zeroing in, the only difference being the high wind I am shooting in today. A little left of center due to the wind.
Took about 20 to 25 minutes for my rifle to cool down to ambient temperature of 74°. Shot three more times and this is what I got.
Friend came up and we got to talking for a while, as the sky became more cloudy and I left the scope on the whole time for a total of about an hour, and at least 30 minutes to 40 minutes after the last group. I saw the temperature of the radiator go to about 89° at its highest point, but with the wind and now more cloud cover I guess it was able to cool back down to about 84 when I pulled the trigger the last three times as shown here.
And in true wildfowlers rifle form, I did jerk the shot on one of these last shot, not following through my trigger pull.
Believe this one shot was operator error and not some mechanical problem with the scope.
This is about as capable as I am able to shoot with this type of scope at this distance on paper.
Not saying that my scope does not have this problem, but I did not see it while using it from a shaded environment with falling external temperature.
What scope mount are you using?