Light weight barrelled guns, you betcha this is a problem. However, heavy bull barrels., not so much. They don't heat up as much from one shot and you can let them cool back down rather quickly. Regardless, if you get a hot group on a light barrel just repeat over multiple days to tweak that first shot PI. I have a lightweight set up for sheep hunting that I'm working on and that is exactly how I'm sighting it in. Of course I'm working on distances over twice what the OP mentioned.