Having only ever fired a few shots in a session to check zero and actually shoot, I have not really worried about poi change due to a warm barrel.
I had an extended zero session on Sunday, using the last of my factory ammo before I start reloading.
I shot 25 rounds, stopping after 10 and 20 to replace the targets.
The last 5 produced some odd results, not sure if it was because I was not seeing the target correctly due to heat haze or the hot barrel affecting poi.
The first 2 shots were almost touching, centre of the bull. Then the last 3 seemed to get progressively lower and left.
What do people find when their barrels warm up?
I was shooting Howa 1500 243 with Sako 90gr soft point 100yds.