RE: Does temperature change POI?
Did you fire more than one shot to see if the next shot hit high? The first shot from a clean barrel will often hit high. I dont know about temperature change effecting POI because most of my shooting is done in colder weather. Check out page 4 of the forum under Dirty M/L shoot better. Cayugad gave some good info there and may be able to answer about temperature change effecting POI as well.
WV Mountaineer