So, we all know light thin barrels heat and after a shot or 3 begin to make patterns instead of groups. After being heated and starting to shoot patterns, do they lose POI after they cool? I am thinking of building a light accurate rifle with a short light barrel but am concerned the POI may change with the same POA if it is allowed to get hot. (one shot per hour for 10 hours, nice group. then 10 shots as fast as you can cycle, group enlarges. Question, after the rifle barrel cools will it shoot one shot per hour in the original nice group?)