We have the freezer outside the door every winter. What happens is people zero in the summer temps and shoot low & miss in the winter when the grouse season is. Another issue which is not taken in to consideration with the mentioned ice-box example is the fact that cold air is denser than warm air: there is more air resistance in the cold.
Barrel temperature may affect POI especially on non-freefloated guns, but the real issue is the powder temperature. If I shoot at relatively rapid pace the round in the chamber has no time to warm up to cause shift. But if I shoot the barrel hot and leave the round in the chamber for few minutes, sure it'll have different POI.



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