Mines a mk3 Simon and it's shifts up to 5 yards at 55 yards in the cold found this out at our first winter league shoot was going great guns but then started to get temp shift it was the first time I'd come across it so what I do now is leave it to come to outside temp and I bought an adjustable range pointer off Andras which I adjust on plinking range before I go to first lane to shoot do this every time now and it's working great.
Walther LG300 Dominator,sightron 10x50x60 ft totally awesome combo
Walther LG300 Dominator,Leupold 20x50x50 spare set up
Air Arms TX200,8x32x44 Buris signature
Air Arms S400,10x44 Viper