Cold bore zero versus (very) Hot bore zero “test”

[HuntHarder]

I have a hard time believing mirage, 5×'d your group. Was it so blurry thst you could barely make out the target?

 

[Mike Islander]

Mirage blows my groups up after 7 or 8 rounds. I must have a fan on the barrel or the chamber fan while I reload the magazine to make it to 10 shots. Even doing this the last 2 rounds I am fighting mirage from the barrel. Then I have mirage from the ground to contend with. I am very curious if the people at 5K altitude and above deal with similar issues? I am under 1000’ sea level generally with 70+% humidity. Most shots are between 6 & 10x

I use a length of narrow cardboard resting on the barrel to block mirage. Works decently well.